..::Frans::.. wrote:As said before, i think this is a sign that the install directory is still in the voard directory, so renaming the install dir should do the trick...

* I believe I am quoting page 16 of this topic on here.
"Sorry but the board is temporarily unavailable, please try again in a few minutes." is the error message. But also was getting "board is disabled" when logged on and when viewing forums.
I just had this same problem. All of a sudden noticed that my board was telling that it was temporarily unavailable when you were not logged in, and that it was disabled when you were logged in. An "admin" could see all of the forums and messages. Probably noone else.
I upgraded to 3.0.1 just to be safe. Was afraid I'd been hacked somehow. Just at the last minute I decided to check my file permissions in the phpBB3 directory. I saw several things owner/group as "33". So I did a chmod of everything in phpBB3 to webservers username. Bada Bing! all fixed.
I think I might have deleted a user on my server awhile back, and I might have used that user to originally install or upgrade phpBB ... by deleting that user I end up with a user/group "33". I guess phpBB didn't like that at all.