OK, I got this error:
There was a compilation error while loading the UBB.classic libraries and data files:
Can't locate Modules/Compress/cgi_buffer.pm in @INC (@INC contains: ./Modules . c:inetpubwwwrootcgi-bin c:inetpubwwwrootcgi-binModules C:/Perl/lib C:/Perl/site/lib) at c:inetpubwwwrootcgi-binultimatebb.cgi line 60.
Please make sure that you uploaded the CGI and Variables files to the proper directory, permissions are set properly on the files, and that paths in the control panel are set correctly.
I checked the permissions and they are the same as all the other directories really. I think I gave them all everything but full control. Paths are obviously set correctly... What did I mess up?