This has been pointed out a lot of times before but for the same of tradition:
If you find yourself logged out, make sure you haven't gone to mapcore.net instead of http://www.mapcore.net. For some reason PHPBB treats the two as two totally different sites, so if you're usually logged in via one and follow a link to the other, it'll show you as logged out.
The real pain is that if you try to log in on one, it seems to wipe your cookie for the other. So before logging in, check that URL. ![]()