If you are referring to the fact that your tables do not have borders with the latest version, the reason for this behavior is that when implementing the Styles feature, we have changed the logic in order to be more compatible with MS Word.
That is why now when a table is created, by default it will not have borders. You can apply the default TableGrid style which is used when inserting a table from the UI in the following way:
table.Style = document.StyleRepository[
If you want to fine-tune the borders and set them to some different value than the default, you can use the following approach:
Border border =
Border(2, BorderStyle.Single, Color.FromArgb(255, 0, 0, 0));
If, however, you are observing other issues, you can open a support ticket and send us the project that creates your document in order to investigate further.
All the best,