Ok, tried via a proxy. Works fine as far as I can tell (no experience with that stuff), while simultaneously failing trying to connect directly to pokertracker.com. Once again, forums were working fine for me, but after an (unsuccesful) attempt at the PT home page, also the forums fell dead for me for about 5 minutes. (But the proxied connection worked during this time.)
Any guesses what could be going wrong? I'm running out of ideas...
