Business theme (white Screen)

I have WPMU 2.9.2 to 1.2.1 BP Business I put the MSD in my THEME folder, I turned on the item and click on the PREVIEW this is displayed perfectly, even in different sections of the page. But when activated, shows me the blank screen, having to restore again.

BP I upgraded to 1.2.3 if that were the reason, and I still have the same error.

I tried several themes in different versions and the same thing happens. The only thing I could install thema has been scolar.

Did anyone show me why?
Thanks in advance for your help.