Aha! With what Jeff mentioned, it seems that you may indeed be a victim of the aforementioned bug:
It seems that this problem was fixed in a Cumulative Update to Service Pack 2; since you're still on Service Pack 1, you're open to being subject to being affected by the bug.
If at all possible, I'd say an upgrade to the most recent service pack would be preferable; that should (hopefully) clear the issue up.
- 😀