diff --git a/Source/UnicodeBrowser/DataAsset_FontTags.cpp b/Source/UnicodeBrowser/DataAsset_FontTags.cpp
index 04f9a09..1b36635 100644
--- a/Source/UnicodeBrowser/DataAsset_FontTags.cpp
+++ b/Source/UnicodeBrowser/DataAsset_FontTags.cpp
@@ -160,6 +160,9 @@ bool UDataAsset_FontTags::ImportFromJson(FString Filename)
 	if (Glyphs.IsEmpty())
 		return false;
 
+	// flush current entries (e.g. on reimport there might be existing data)
+	Characters.Empty();
+	
 	for (TSharedPtr<FJsonValue> const& GlyphValue : Glyphs)
 	{
 		TSharedPtr<FJsonObject> const Glyph = GlyphValue->AsObject();
diff --git a/Source/UnicodeBrowser/ImportFactory/GlyphTagsImportFactory.cpp b/Source/UnicodeBrowser/ImportFactory/GlyphTagsImportFactory.cpp
index 30b0010..80298b6 100644
--- a/Source/UnicodeBrowser/ImportFactory/GlyphTagsImportFactory.cpp
+++ b/Source/UnicodeBrowser/ImportFactory/GlyphTagsImportFactory.cpp
@@ -23,8 +23,13 @@ UGlyphTagsImportFactory::UGlyphTagsImportFactory(FObjectInitializer const& Objec
 
 bool UGlyphTagsImportFactory::CanReimport(UObject* Obj, TArray<FString>& OutFilenames)
 {
-	UDataAsset_FontTags const* Object = Cast<UDataAsset_FontTags>(Obj);
-	return IsValid(Object) && FactoryCanImport(Object->SourceFile);
+	if(UDataAsset_FontTags const* Object = Cast<UDataAsset_FontTags>(Obj))
+	{
+		OutFilenames.Add(Object->SourceFile);
+		return IsValid(Object) && FactoryCanImport(Object->SourceFile);
+	}
+
+	return false;
 };
 
 void UGlyphTagsImportFactory::SetReimportPaths(UObject* Obj, TArray<FString> const& NewReimportPaths)
@@ -38,7 +43,8 @@ void UGlyphTagsImportFactory::SetReimportPaths(UObject* Obj, TArray<FString> con
 
 bool UGlyphTagsImportFactory::FactoryCanImport(FString const& Filename)
 {
-	FString JsonString;
+	FString JsonString = "";
+	
 	if (!FFileHelper::LoadFileToString(JsonString, *Filename))
 		return false;
 
@@ -46,7 +52,7 @@ bool UGlyphTagsImportFactory::FactoryCanImport(FString const& Filename)
 	auto const Reader = TJsonReaderFactory<>::Create(JsonString);
 	FJsonSerializer::Deserialize(Reader, JsonObject);
 
-	return JsonObject->HasField(TEXT("format")) && JsonObject->GetStringField(TEXT("format")) == "UnicodeBrowserGlyphTags_V1";
+	return JsonObject->HasTypedField<EJson::String>(TEXT("format")) && JsonObject->GetStringField(TEXT("format")) == TEXT("UnicodeBrowserGlyphTags_V1");
 }
 
 UObject* UGlyphTagsImportFactory::ImportObject(UClass* InClass, UObject* InOuter, FName const InName, EObjectFlags const InFlags, FString const& Filename, TCHAR const* Parms, bool& OutCanceled)
diff --git a/Source/UnicodeBrowser/UnicodeBrowser.cpp b/Source/UnicodeBrowser/UnicodeBrowser.cpp
index b0a8809..9bb4e01 100644
--- a/Source/UnicodeBrowser/UnicodeBrowser.cpp
+++ b/Source/UnicodeBrowser/UnicodeBrowser.cpp
@@ -58,15 +58,7 @@ TSharedRef<SDockTab> FUnicodeBrowserModule::OnSpawnPluginTab(FSpawnTabArgs const
 	return SNew(SDockTab)
 		.TabRole(ETabRole::NomadTab)
 		[
-			SNew(SVerticalBox)
-			+ SVerticalBox::Slot()
-			.FillHeight(1.0f)
-			.FillContentHeight(1.0f)
-			.HAlign(HAlign_Fill)
-			.VAlign(VAlign_Fill)
-			[
-				SNew(SUnicodeBrowserWidget)
-			]
+			SNew(SUnicodeBrowserWidget)			
 		];
 }
 
diff --git a/Source/UnicodeBrowser/UnicodeBrowserRow.h b/Source/UnicodeBrowser/UnicodeBrowserRow.h
index c17759d..0c324fa 100644
--- a/Source/UnicodeBrowser/UnicodeBrowserRow.h
+++ b/Source/UnicodeBrowser/UnicodeBrowserRow.h
@@ -3,6 +3,7 @@
 #include "Fonts/UnicodeBlockRange.h"
 
 #include "Framework/Application/SlateApplication.h"
+#include "Internationalization/TextChar.h"
 
 class FUnicodeBrowserRow : public TSharedFromThis<FUnicodeBrowserRow>
 {
@@ -12,11 +13,15 @@ class FUnicodeBrowserRow : public TSharedFromThis<FUnicodeBrowserRow>
 		BlockRange(BlockRangeIn),
 		FontInfo(FontInfoIn)
 	{
-		FUnicodeChar::CodepointToString(Codepoint, Character);
+		if(Codepoint != -1)
+		{
+			bHasValidCharacter = FTextChar::ConvertCodepointToString(Codepoint, Character);	
+		}		
 	}
 
 	FString Character;
-	int32 Codepoint = 0;
+	bool bHasValidCharacter = false;
+	int32 Codepoint = -1;
 	TOptional<EUnicodeBlockRange> BlockRange;
 
 	bool bFilteredByTag = false;
diff --git a/Source/UnicodeBrowser/UnicodeBrowserStatic.cpp b/Source/UnicodeBrowser/UnicodeBrowserStatic.cpp
index d960fdb..55d71ce 100644
--- a/Source/UnicodeBrowser/UnicodeBrowserStatic.cpp
+++ b/Source/UnicodeBrowser/UnicodeBrowserStatic.cpp
@@ -11,7 +11,7 @@ TOptional<EUnicodeBlockRange> UnicodeBrowser::GetUnicodeBlockRangeFromChar(int32
 {
 	for (auto const& BlockRange : FUnicodeBlockRange::GetUnicodeBlockRanges())
 	{
-		if (BlockRange.Range.Contains(CharCode))
+		if (BlockRange.GetRange().Contains(CharCode))
 		{
 			return BlockRange.Index;
 		}
@@ -25,12 +25,12 @@ TArrayView<FUnicodeBlockRange const> UnicodeBrowser::GetUnicodeBlockRanges()
 	if (Ranges.IsEmpty())
 	{
 		Ranges = FUnicodeBlockRange::GetUnicodeBlockRanges();
-		Ranges.StableSort(
+		/*Ranges.Sort(
 			[](FUnicodeBlockRange const& A, FUnicodeBlockRange const& B)
 			{
-				return A.DisplayName.CompareTo(B.DisplayName) < 0;
+				return A.GetDisplayName().CompareTo(B.GetDisplayName()) < 0;
 			}
-		);
+		);*/
 	}
 	return Ranges;
 }
diff --git a/Source/UnicodeBrowser/UnicodeBrowserStatic.h b/Source/UnicodeBrowser/UnicodeBrowserStatic.h
index a76f208..ea1ec0f 100644
--- a/Source/UnicodeBrowser/UnicodeBrowserStatic.h
+++ b/Source/UnicodeBrowser/UnicodeBrowserStatic.h
@@ -8,8 +8,8 @@ namespace UnicodeBrowser
        TCHAR constexpr InvalidSubChar = TEXT('\uFFFD');
        TOptional<EUnicodeBlockRange> GetUnicodeBlockRangeFromChar(int32 const CharCode);
 
-       static TArrayView<FUnicodeBlockRange const> Ranges; // all known Unicode ranges
-       TArrayView<FUnicodeBlockRange const> GetUnicodeBlockRanges();
+       static TConstArrayView<FUnicodeBlockRange const> Ranges; // all known Unicode ranges
+       TConstArrayView<FUnicodeBlockRange const> GetUnicodeBlockRanges();
 
        static FString GetUnicodeCharacterName(int32 CharCode);
 
diff --git a/Source/UnicodeBrowser/UnicodeBrowserWidget.cpp b/Source/UnicodeBrowser/UnicodeBrowserWidget.cpp
index e85e936..6ec13b9 100644
--- a/Source/UnicodeBrowser/UnicodeBrowserWidget.cpp
+++ b/Source/UnicodeBrowser/UnicodeBrowserWidget.cpp
@@ -571,7 +571,7 @@ void SUnicodeBrowserWidget::PopulateSupportedCharacters()
 		RowsRaw.Add(Range.Index);
 		TArray<TSharedPtr<FUnicodeBrowserRow>>& RangeArray = RowsRaw.FindChecked(Range.Index);
 
-		for (int CharCode = Range.Range.GetLowerBound().GetValue(); CharCode <= Range.Range.GetUpperBound().GetValue(); ++CharCode)
+		for (int CharCode = Range.GetRange().GetLowerBound().GetValue(); CharCode <= Range.GetRange().GetUpperBound().GetValue(); ++CharCode)
 		{
 			auto Row = MakeShared<FUnicodeBrowserRow>(CharCode, Range.Index, &CurrentFont);
 
diff --git a/Source/UnicodeBrowser/Widgets/SUnicodeBlockRangeSelector.cpp b/Source/UnicodeBrowser/Widgets/SUnicodeBlockRangeSelector.cpp
index d77b16e..dedeb2f 100644
--- a/Source/UnicodeBrowser/Widgets/SUnicodeBlockRangeSelector.cpp
+++ b/Source/UnicodeBrowser/Widgets/SUnicodeBlockRangeSelector.cpp
@@ -39,17 +39,17 @@ void SUnicodeBlockRangeSelector::Construct(FArguments const& InArgs)
 						return FText::GetEmpty();
 
 					int32 const Num = UnicodeBrowser.Pin().Get()->Rows.Contains(Range.Index) ? UnicodeBrowser.Pin().Get()->Rows.FindChecked(Range.Index).Num() : 0;
-					return FText::FromString(FString::Printf(TEXT("%s (%d)"), *Range.DisplayName.ToString(), Num));
+					return FText::FromString(FString::Printf(TEXT("%s (%d)"), *Range.GetDisplayName().ToString(), Num));
 				}
 			)
 			.ToolTipText(
 				FText::FromString(
 					FString::Printf(
 						TEXT("%s: Range U+%-06.04X Codes U+%-06.04X - U+%-06.04X"),
-						*Range.DisplayName.ToString(),
+						*Range.GetDisplayName().ToString(),
 						Range.Index,
-						Range.Range.GetLowerBoundValue(),
-						Range.Range.GetUpperBoundValue()
+						Range.GetRange().GetLowerBoundValue(),
+						Range.GetRange().GetUpperBoundValue()
 					)
 				)
 			)
@@ -106,7 +106,7 @@ void SUnicodeBlockRangeSelector::SetRanges(TArray<EUnicodeBlockRange> const& Ran
 			continue;
 		}
 
-		if (CheckboxIndices[Range.Index], RangesToSet.Contains(Range.Index))
+		if (RangesToSet.Contains(Range.Index))
 		{
 			CheckBoxList->SetItemChecked(CheckboxIndices[Range.Index], ECheckBoxState::Checked);
 		}
diff --git a/Source/UnicodeBrowser/Widgets/SUnicodeBrowserSidePanel.cpp b/Source/UnicodeBrowser/Widgets/SUnicodeBrowserSidePanel.cpp
index e3b1e12..1fc0306 100644
--- a/Source/UnicodeBrowser/Widgets/SUnicodeBrowserSidePanel.cpp
+++ b/Source/UnicodeBrowser/Widgets/SUnicodeBrowserSidePanel.cpp
@@ -87,7 +87,8 @@ void SUnicodeBrowserSidePanel::Construct(FArguments const& InArgs)
 					]
 					.BodyContent()
 					[
-						SAssignNew(CurrentCharacterDetails, SUnicodeCharacterInfo).Row(UnicodeBrowser.Pin().Get()->CurrentRow)
+						SAssignNew(CurrentCharacterDetails, SUnicodeCharacterInfo)
+						.Row(UnicodeBrowser.Pin().Get()->CurrentRow)
 					]
 				]
 				+ SVerticalBox::Slot()
diff --git a/Source/UnicodeBrowser/Widgets/SUnicodeCharacterInfo.cpp b/Source/UnicodeBrowser/Widgets/SUnicodeCharacterInfo.cpp
index 84a7327..9466551 100644
--- a/Source/UnicodeBrowser/Widgets/SUnicodeCharacterInfo.cpp
+++ b/Source/UnicodeBrowser/Widgets/SUnicodeCharacterInfo.cpp
@@ -13,12 +13,16 @@ void SUnicodeCharacterInfo::Construct(FArguments const& InArgs)
 {
 	SInvalidationPanel::Construct(SInvalidationPanel::FArguments());
 	SetCanCache(true);
-	SetRow(InArgs._Row);
+	
+	if(InArgs._Row.IsValid())
+	{
+		SetRow(InArgs._Row);
+	}
 }
 
 void SUnicodeCharacterInfo::SetRow(TSharedPtr<FUnicodeBrowserRow> InRow)
 {
-	if(!InRow.IsValid())
+	if(!InRow.IsValid() || !InRow->bHasValidCharacter)
 		return;
 
 	FText TagsText = FText::GetEmpty();
@@ -29,9 +33,11 @@ void SUnicodeCharacterInfo::SetRow(TSharedPtr<FUnicodeBrowserRow> InRow)
 	}
 
 	FString BlockRangeName = "";
-	if(FUnicodeBlockRange const *Range = UnicodeBrowser::GetUnicodeBlockRanges().FindByPredicate([Needle = InRow->BlockRange.Get(EUnicodeBlockRange::ControlCharacter)](FUnicodeBlockRange const &Range){ return Range.Index == Needle; }))
-	{
-		BlockRangeName = *Range->DisplayName.ToString();	
+	if(InRow->BlockRange){
+		if(FUnicodeBlockRange const *Range = UnicodeBrowser::GetUnicodeBlockRanges().FindByPredicate([Needle = InRow->BlockRange.Get(EUnicodeBlockRange::ControlCharacter)](FUnicodeBlockRange const &Range){ return Range.Index == Needle; }))
+		{
+			BlockRangeName = *Range->GetDisplayName().ToString();	
+		}
 	}
 	
 	SetContent(