I'd submit this on trac but it won't let me log in.
Depending on where I was connecting from, I was getting intermittent 405 errors when submitting comments. Turns out user agent strings can be longer than 255 characters these days. I bumped that field up to VARCHAR(1000) and all is well.
Some other people were getting this error as well, and their problems didn't sound resolved. Hopefully they'll see this. :)