First column of the pivotgrid has width based on the header (see attached screenshot). It's obvious that the header should span between columns.

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http://feedback.telerik.com/Project/184/Feedback/Details/190092 
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This item is migrated to the Telerik Document Processing portal: 
http://feedback.telerik.com/Project/184/Feedback/Details/190093 
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Workaround:
Copy the default styles after the Mail Merge

RadFlowDocument merged = sourceDocument.MailMerge(mailMergeSource);
merged.DefaultStyle.ParagraphProperties.CopyPropertiesFrom(sourceDocument.DefaultStyle.ParagraphProperties);
merged.DefaultStyle.CharacterProperties.CopyPropertiesFrom(sourceDocument.DefaultStyle.CharacterProperties);
This item is migrated to the Telerik Document Processing portal: 
http://feedback.telerik.com/Project/184/Feedback/Details/190096 
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If the value from the source contains new lines, they should be inserted in the resulting documents as new paragraphs.
This item is migrated to the Telerik Document Processing portal: 
http://feedback.telerik.com/Project/184/Feedback/Details/190097 
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When defaultThemeVersion is missing from the file, some styles are not shown when the document is opened in MS Excel.
This item is migrated to the Telerik Document Processing portal: 
http://feedback.telerik.com/Project/184/Feedback/Details/190098 
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This item is migrated to the Telerik Document Processing portal: 
http://feedback.telerik.com/Project/184/Feedback/Details/190099 
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This item is migrated to the Telerik Document Processing portal: 
http://feedback.telerik.com/Project/184/Feedback/Details/190101 
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Available in LIB version 2016.1.118, it will be also available in the 2016 Q1 SP Release.

This item is migrated to the Telerik Document Processing portal: 
http://feedback.telerik.com/Project/184/Feedback/Details/190103 
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When the last element from a table cell is an empty line, the latter is skipped and not imported.
This item is migrated to the Telerik Document Processing portal: 
http://feedback.telerik.com/Project/184/Feedback/Details/190105 
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This item is migrated to the Telerik Document Processing portal: 
http://feedback.telerik.com/Project/184/Feedback/Details/190106 
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Add support for MID function:

https://support.office.com/en-us/article/MID-MIDB-functions-d5f9e25c-d7d6-472e-b568-4ecb12433028

MID returns a specific number of characters from a text string, starting at the position you specify, based on the number of characters you specify.

MID(text, start_num, num_chars)
This item is migrated to the Telerik Document Processing portal: 
http://feedback.telerik.com/Project/184/Feedback/Details/190109 
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This item is migrated to the Telerik Document Processing portal: 
http://feedback.telerik.com/Project/184/Feedback/Details/190114 
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This item is migrated to the Telerik Document Processing portal: 
http://feedback.telerik.com/Project/184/Feedback/Details/190116 
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Declined because the issue is originally caused by Form XObject missing functionality. You may subscribe for the following feedback item instead: http://feedback.telerik.com/Project/184/Feedback/Details/190108-implement-import-of-form-xobjects

Please add a link to the new TDP library and explain it, so people can find the place to vote for PDFProcessing!
http://feedback.telerik.com/Project/184/Feedback

Currently, the design-time theme changer automatically removes previous references to Telerik themes. If the application has runtime theme change logic, the old theme references are needed and the developer needs to add them manually, which is annoying.