Suite Thought I would share my 4.0.1 upgrade
 

I've been running 4.0 on my test forum with no problem, able to post, create articles, etc.

I then ran the 4.0.1 upgrade with no errors. I could get to the CMS tab one time, if I browsed away, and came back to CMS I would get server 500 errors. Forums and blogs worked fine

I'm running 2008 R2, IIS 7.5, PHP 5.3, and MySQL 5.1.39.

Feeling this was a bit odd, I did the upgrade straight from 3.8.4PL2 to 4.0.1. Same issue, after running all database maintenance stats before starting the upgrade.

I fell back again, starting from 3.8.4PL2 and just went back to 4.0. This issue does not exist in 4.0, but the second I move to 4.0.1, and then try to get to the CMS tab more than once, I immediately start getting 500 errors.

I think I've stumped Edwin, so I thought I'd post here and see if anyone had any ideas.