Just ideas that might work.
1) Delete the entire 10909-DIV and restart it from scratch.
2) If it still happens. kick out of there, then switch to Forms Mode, find that 1099-DIV form, and enter the additional information directly on the form. IF you have $$ in box 11, you might have problems figuring out what to enter below it in Forms Mode, but switching back to the interview might work now if you've entered some of those extra box $$$ in Forms mode