WB5.1 problems?

I used sd central to update WB5.01 to 5.1, that went fine. Then, I attempted to install the additional skins listed, and that failed, log indicating product registration is false. I then proceeded to update SDC, and my machine decided to crawl at a snail's pace. After some tweaking and 2 reboot's, it seemed to straighten out. After reading some posted complaints, I tried to download a theme, and it does not show up in the app at all. I even explored the program folders, and it did not copy in. Anyone else experience something similar? I'll try to root out the problem for shi_'s and giggles. If I find some tweak or fix, I'll post it and notify SD.