UBB.threads PHP Forum Software Community Forums UBB.threads 7 Installation and Upgrade Support Whole heap of troubles following 7.4 upgrade

Hi all
I upgraded my site to 7.4 (from 7.2.2) yesterday, and now i have lost all formatting. Whats worse is that i can no longer sign in. When i click on the login link i get a 404.

Take a peek at my site to see what i mean.

Any help would be appreciated

Cheers