Kat, there does seem to be a limit to the # of threads it will bring up. I've run into it before and I believe others have mentioned it in the past. Have you tried the search function looking for msgs created by yourself and try to find it that way. You will spend a lot of time going through page after page, if you (and I you are) like me tend to post a lot, but you will eventually get to it.

What can you remember about it?