When sending a PM, it looks like all line breaks are ignored, mashing all paragraphs into a solid block of text. Other message formatting seems to be ignored as well (e.g. lists, horizontal lines, etc.).

Not a huge deal, but it makes messages harder to read/write in a decent way.

It's supposed to use markdown. I think you have to use double spaces at the end of a line so it counts the line break. :P I'm not even sure that completely works correctly though.