Hello, problem still persists.
If I open test.doc in Word 2010, then select all (ctrl+A), copy and paste into your example with the latest version (4.0.20131.200) of C1Editor (no matter which .NET), than nothing happen (table dissappear right after pasting). I can paste only if I first select all in C1Editor Design mode (ctrl+A) and then paste. Then the table will be pasted, but if I switch to source, this line throws exception which I send you in the attachement:
c1Editor1.Mode = C1.Win.C1Editor.EditorMode.Source;