Not here (forums.psychcentral.com). When something of the kind has happened to me at other sites it's often been because my browser was somehow set to refuse cookies from those sites.

I've had plenty of difficulty logging in to psychcentral.net to comment on the blogs even though I copy-pasted my password directly from the e-mail and went out of my way to make sure both the site itself and the particular blog were on my "accept cookies" list. I don't even know if the difficulty still persists -- I quit trying a few weeks ago.

(As a mildly amusing aside: when I have Spybot S&D scan my computer, sometimes -- by no means always -- it logs me out of "keep-me-logged-in" sites like PC so that when I come back after the scan I "don't have permission" to access my Subscriptions page until I log back in.)