Forum Problems after upgrading vb 4.0.5. (forum is not redirectering) Urgent

[محروم.كوم]

after upgrading vb from 4.0.3 to 4.0.5 Im getting this on browsers

Code:
The page isn't redirecting property

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

* This problem can sometimes be caused by disabling or refusing to accept
cookies.
What went wrong?
I went back and installed the previous database and the previous files and I still have the same problem. The admincp and modcp works good is just the page itself not working correctly. __DEFINE_LIKE_SHARE__