I decided to switch from 1and1 to Media Temple a few days ago, everything went pretty smooth except for the forum. I couldn’t save it. It has a weird problem that I’ve never seen before.
I installed a new fresh forum. It worked. Did the merge the forum user_table together with the wp_user table, it worked. Import the old database in, forum went blank.
When I did it the other way, I couldn’t login.