I logged in as you, checked out a few forums, your MyFlyerTalk area, and left a test post above, and I didn't have any account problems.

It really sounds like something on your end, either with your browser or with your ISP. Can you try accessing FlyerTalk from a different browser (something other than the brand you're currently using, be it Internet Explorer, Mozilla, etc.) and see if you still have those login problems?

Sorry about all this, but it's something that I can't seem to duplicate on this end. I checked the vBulletin support forums, and there were no unresolved issues related to this that I could find.