Yes, I have seen this problem, too. I put in the filter for some *.tmp files, and on most of my servers, it works fine. However, on one or two of them, I'm still getting the error.
I haven't been able to prove what's going on, but it always seems to be the same .tmp file that flags the error, and others are skipped, so I'm suspecting that the file is already in some sort of weird locked state, or perhaps already open when I installed the BAOF, and that might be causing my problem. I'm suspecting, if that's it, a reboot should clear it up, but I have not had the opportunity to reboot the problem servers, as they are production.
But then again, I could be completely wrong.
If you do find a solution, please post it.