OK, I just restored everything to about where I had it and tried again. Exact same error...
There was a compilation error while loading the UBB.classic libraries and data files:
Can't locate /cgi/vars_rate.cgi at cgiultimatebb.cgi line 129.
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.
It seems I am getting the same errors as Multihack...
There was another post on another older thread with the same error message as me on an older version. It's here:
https://www.ubbdev.com/ubb/ultimatebb.php/ubb/get_topic/f/20/t/000167/p/5 By Bo$$
Any other possibilities? I do have several other hacks installed.. Maybe there is a conflict?