When mailmerging a document, with nested mail merge group which starts inside a table and ends outside the table, a NullReferenceException is thrown: "System.NullReferenceException: 'Object reference not set to an instance of an object.' firstParagraphInTemplate was null."
Workaround: move the group end (EndGroup, TableEnd, RangeEnd, or GroupEnd) merge field inside the table where the group starts.
Merge field group in a single table cell causes it to replicate more times than expected.
Workaround: add a second column to the table and move the TableEnd/GroupEnd/EndGroup/RangeEnd merge field inside it.
Nested Mail Merge cannot handle empty lists.
Workaround: Replace the empty list with null.
Add support for shapes, and especially for shapes with textual content. In OOXML, shapes are represented by the wps:wsp element, and shapes with textual content by <wps:txbx>, <w:txbxContent>. Such shape can be added to a Word document using the Insert -> Text -> Text Box -> Draw Text Box, or through a shape's context menu -> Add Text. Do not confuse these shapes with Text/Rich Text content controls (see https://feedback.telerik.com/Project/184/Feedback/Details/190057 )