Update: I can get it to work perfectly on one forum at a time only. Files upload no problem.
As soon as I edit another forum's properties, the previous forum loses its uploadability.
This should be an easy fix, and sounds likes it's a common problem that never got resolved... or resolution got abandoned for the next rev. Well, not everybody has 6.10.10.10 loaded.
If anybody knows how to fix the issue of radio buttons not sticking on multiple forums, please, please let me know.