Ok, mope, been at this a while and I think you have two problems. The RC4 upgrade fails on a RC3 test install, it changes the copyright version, but not smf_settings. Your production forum may still be RC3. However, you should be able to upgrade to 2.0.13. I've done this several times, RC3 -> RC4 fails, RC3 -> 2.0.13 works. RC3, RC4, and 2.0.13 all have the karma_good field, so upgrader doesn't replace it. Best guess is you have a bad database dump. You need to do it again, either with backup utility in your host control panel (if it has one), or phpmyadmin. Dump it 2-3 times, see if file size is same. You have a large database, phpmyadmin will sometimes timeout without error, and you end up with an incomplete dump.