German umlauts (the characters 'Ä', 'Ö', 'Ü', 'ä', 'ö' and 'ü') will not be printed to a generated pdf file, but the other German "special" character "ß" works.

 

I use the trial version via the Telerik NuGet feed. A test program and my locally generated file are attached.

A remote go-to action is similar to an ordinary go-to action but jumps to a destination in another PDF file instead of the current file.

PdfProcessing: Signature field validation fails if a document is imported from a byte array of CopyStream property is false.

Workaround: Set the CopyStream property of the ImportSettings to true:

PdfFormatProvider formatProvider = new PdfFormatProvider();
formatProvider.ImportSettings.CopyStream = true;

Exported checkbox fields have state "/On " instead of "/Yes ". 

Inserting a table with more than 10K rows is very slow.

Workaround: 

Use the following approach with SpreadStreamProcessing,SpreadProcessing and PdfProcessing:

 1) Generate an xlsx document with RadSpreadStreamProcessing 
 2) Import the document from 1) with RadSpreadProcessing 
 3) export 2) to PDF

The CIDToGIDMap value is exported as an indirect object. When the value is a PdfString ist should be directly exported and not referred as an indirect object. 

More information is available in the Pdf Reference 1.7. Page 442 lists all predefined CMaps that should be imported and exported as PdfName objects. At this point, trying to import a document with such encoding, a NotSupportedException is thrown with message Encoding type is not supported.

OutOfMemoryException has thrown when creating a thumbnail with the ThumbnailFactory.

This behavior is observed with binaries version 2020.2.513 or later.

A StackOverflowException is thrown when cloning documents containing a page containing links to the same page. 

In Adobe Acrobat, if you bring up the "Document Properties" dialog window and then click on the "Advanced" tab, there is a property under the "Print Dialog Presets" section called "Page Scaling". We should preserve the value on import/export and be able to set it in the code behind.

AcroForms are not saved when splitting a document into pages. This leads to forms not being recognized when the file is imported back.

Currently, importing a document with non-embedded TrueType font will result in a font instance with an empty font source. Support should be added for providing custom font data of TrueType fonts during document import.

By specification, the URI property of URI Actions is encoded in 7-bit ASCII string. For this reason, our current implementation relies on that the property will be of type PdfLiteralString. However, in cases such as password-encrypted documents, the property may be encoded with PdfHexString which leads to InvalidCastException: 'Unable to cast object of type Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfHexString' to type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfLiteralString'.', on document import.

By specification, FitH destinations are defined with page and top position. A null value for top specifies that the current value of that parameter is to be retained unchanged. However, importing such a document with PdfProcessing leads to ArgumentOutOfRangeException:  'Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index'.

When importing document with text containing char code mapped to .notdef glyph name an ArgumentException: 'The encoding is not supported.' is thrown.

NullReferenceException has thrown when importing a form XObject with null Resources in PDF dictionary.

Add a PDF document validator to validate (before the import of the document) an existing PDF document.

 InvalidCastException when importing a file with missing space. The file contains no space between the objects declarations and the page content and this is why the exception occurs.

When importing a VariableContent widget with OpenType font, which fails to read the post table of the font file, a NullReferenceException is thrown when the RecalculateContent() method is called.

Workaround: Change the widget font:

foreach (Widget widget in textBoxField.Widgets)
{
    widget.TextProperties.Font = FontsRepository.Helvetica;
    widget.RecalculateContent();
}

More information is available in the Pdf Reference 1.7. Page 442 lists all predefined CMaps that should be imported and exported as PdfName objects. At this point, trying to import a document with such encoding, a NotSupportedException is thrown with message Encoding type is not supported.