I'm not sure if the problem revolves around the validators but I'll share my experience. I downloaded the validator zip file, copied the files into my web project as an interim solution, re-added the tag mappings to point to the temporary validators, compiled, tested and things worked great.
I had a problem due to multiple views within an update panel. The first view's validators worked fine prior to the interim fix, but all other view validators failed. Now everything works correctly as it did with the RC.
Now I'll just keep an eye out for the patch.
Thanks.
Rudy