Ok, definitely looks like going to need to contact your host on this. If I close my browser completely, and then try to go directly to a user profile *sometimes* I can get it to come up. Sometimes it will still hang.
When it's hanging, I've tried added debug code as the very first line to the main ubbthreads.php script, where all it should do is print out "Debugging, back shortly." and then exit. I can't even get that to appear, so it seems like it won't even execute the php script at all when it hangs.
