I'm getting redirected to an error page when I post, but the posts are still going through...
"Ran into problems sending Mail. Error: 535 Incorrect authentication data"
I got that a couple times, too.
I get this fairly frequently also, just since those few days a couple weeks ago when the site was all screwed up and you couldn't log on and the more recent front-page stuff "disappeared" for awhile. I have tried to diagnose what it is that I'm doing when it shows up (ie: am I "quoting" or something) but I have not been able to pin it down. The posts are there, though. It just adds an extra step because you have to back off the error page...
Edit: It did it just now with this post! Grrrr...