Apologies for the delayed response - we had some technical issues with the forum.
We tested with a simple RTF roundtrip and a simple table:
MemoryStream stream = new MemoryStream();
nRichTextViewWithRibbonControl1.Widget.View.SaveToStream(stream, new NRtfTextFormat());
nRichTextViewWithRibbonControl1.Widget.View.LoadFromStream(stream, new NRtfTextFormat(), null);
and the control imported a table with the same dimensions (the Allow Spacing Between Cells did not roundtrip correctly though). Can you send us the control contents in some other format (docx or nevron) to test whether the problem is related to the content being serialized somehow?
Nevron Support Team