This is reproducible when the field VariableTextProperties has zero value for font size. 

Fix available in LIB Version 2018.1.402.

This is not a valid PDF scenario as having appearance state requires having multistate appearances. However, we should handle this invalid document scenario on our side so that the app does not crash with NullReferenceException.

This happens only in scenarios when the widget has On state appearance defined and Off state appearance missing. If both appearances are missing then RadPdfViewer recalculates the appearances and the checkbox is successfully selected and deselected.

The file contains the following:
68.637 604.561 455.981 -107.996 re
72.237 604.561 l
S
Instead of the more usual
68.637 604.561 455.981 -107.996 re
S
72.237 604.561 l
S
Both are valid but the first seems to create a problem.

Fix available in LIB Version 2018.1.319.

The exception is thrown when the RadioButtonField options array contains nested arrays instead of string values.

Fix available in LIB Version 2018.1.312.

This happens only in specific scenarios as most of the documents with annotations are visualized correctly.

Images decoded with CCITTFaxDecode filter affect the performance when showing the document.

Most PDF viewers have option (enabled by default) which allows fields to be highlighted with colors predefined in the settings. Required fields are highlighted using different color.

For example: In Adobe Acrobat Reader DC this is enabled in "Edit" -> "Preferences" -> "Forms" -> "Highlight Color" -> "Show border hover color for fields". 

Expose a button in the UI that can be used instead of Ctrl+F.

Such a button can be currently added by customizing the default toolbar. For more information, check the documentation that describes how to achieve that: https://docs.telerik.com/devtools/wpf/controls/radpdfviewer/default-ui#customizing-the-default-ui

At the moment the theme of the RadPdfViewerToolBar can be set only by setting the theme of the entire application. The individual setting (using telerik:StyleManager.Theme="Windows8") should also be supported.

When a PDF is printed all images are omitted.

Available in R1 2018 SP1 version.

This exception seems to be related to AES algorithm PaddingMode property. 

This exception seems to be caused because the stream is not decrypted correctly and the stream data is corrupted. For instance when the stream is with FlateDecode filter the exception is InvalidDataException with message "Unknown compression method".

This exception is thrown because there is field name with special characters which are incorrectly modified during the recalculation process of widget appearances. This exception is thrown in the internal RecalculateMissingAppearances method or in RecalculateWidgetAppearancesOld method.

Setting Handle property to false should result in rethrowing the exception and interrupting current RadFixedDocument rendering. This is related to Exception Handling Mechanism mentioned in this documentation article: 

https://docs.telerik.com/devtools/wpf/controls/radpdfviewer/document-model/exceptionhandling

Loading page with a lot of text takes several minutes which is unacceptable. This performance issue is caused by class GlypInfoFactory, which caches the glyph information.

Available in LIB Version 2017.3.1225.

For some fonts the issue is present. Some of them are:

KozGoPro-Medium

KozMinPro-Regular

KozGoPro-Bold

Enable the customers to directly save the document inside PdfViewer to a file or a stream.

Available in LIB Version 2017.3.1225.

Layers represent groups of optional content which can be hidden or shown.

The Ò symbol is not found in the encoding as is rendered as a ".notdef" glyph.

Available in LIB Version 2017.3.1127.