Really 0.9.2 compiled from source on kde 3.5.10-3.fc10.
Tried to enter a reinvested dividend. The security was originally configured for shares and price per share. I entered both fields and ended up with a long fractional value - which is perhaps why it refused to post the first time.
Changed the security to enter total value of shares. Still didn't want to post the transaction.
Eventually duplicated an old reinvested dividend and then edited it to match the new values. Posted the edits just fine.