This has me completely stumped. Maybe not even a b2evo problem, but I thought I'd ask and see if anyone has any ideas.

I have had several people register on my site, and that went fine, but when they try to go to the Login page, it is completely blank. No error message, just blank. But this isn't happening to everyone. Others are logging in just fine.

Any ideas? Or is there some way I can log them in myself?

Thanks for any help/ideas.