[whpalmer4]

What are you using for column type and summary type? I haven't managed to reproduce this problem, but maybe it only applies to certain combinations that I haven't tried. My test cases always gave me an Undo option which gave me the document state before the unwanted keypress.

Have you considered using the preference that controls the behavior of the Tab key? I'm guessing that your issue depends on Tab causing the row to be indented (hard to see how moving to a different cell could be an issue), right?

Are you doing a summary on the topic column?