After months forums are still missing two key features:

1) Staying logged in for a reasonable amount of time (45 minutes is not reasonable for a forum - far from it).
2) Automatic redirection to the previous page once a person does log in.

These two features are two of the key end user experience features for a forum. I dare you to find any forum with at all comparable user base, that's missing these two essentials.
It's quite simple, really. Until forums have these two features back*, your users will de facto have an awful user experience on your forums.

*that's the saddest part.