Reward will be given...

I have a problem when new users sign up to my page. Some of the profiles are not wieveable. Let´s say I have 10 new signups, and 5 of those don´t work. I can see all the profiles in "new members" but when I click on a memer´s picture, I´m getting a blank page.

I have tried many things, and I think this error came when I upgraded from 7.0.4 -7.0.5