I've had tons of problems commenting and posting with Chrome today, but Firefox appears to work fine.

Using Chrome on both XP and Win7, though I'm logged-in, it tells me that I'm logged-out and it logs me out when I try to post or recommend, then after I log back in, it again takes me through the loop. I've had at least two comments and one post not go through after frustratingly looping around, but even though I immediately changed after this last time, posting with Firefox (on Win7) seems to work. (I haven't tried IE)