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.
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.
Nested Mail Merge cannot handle empty lists.
Workaround: Replace the empty list with null.
With the current implementation of the RadFlowDocumentEditor`s CharacterFormatting.FontWeight.LocalValue accepts only FontWeights.Bold and FontWeights.Normal and throws an exception when setting different weights (ex. Black, Thin, etc.).