Wow, I'm not happy at all.
libdb changes have destroyed all of my wallet.dat files. I have no DRK.
Ran into the issue before. Use -salvagewallet Should repair it. Then tranfer all to new wallet.
Make sure your using libdb 4.8
Blackempress or some such name as that, on the darkcointalk forums, had the same issue with RC3 and was able to recover. Might talk to her.