BoJosley wrote:
I am pleased to report that I finally made the upgrade from 1.0.0(Beta) to 1.0.3 thanks to the efforts of grumblemarc who generously offered to look at my backend (not everyday I allow people to look at my backend but I was grateful he did). I believe that he ran the sql and had the same problem as me with the "No Forum In this Category". He then ran the sql upgrade script for 1.0.1 and that seemed to do the trick. I think this was more or less advised by bpowers84 too. Anyway I am up to date and very pleased with both the upgraded component and with all the help I received through this forum. Thank you.
This is from the second page in this very thread.

Have you tried this?