I'm not sure if this has been reported before. Anyway, I wanted to send myself a PM. The description at the participants box said the field can be left blank if you want to start a conversation with yourself. This didn't work for me. I got the message "No users were found with these names" instead. It only worked once I entered my own name in the participants box.

Doing this also deletes whatever content was in the subject and message boxes. I had it copied to the clipboard so I wasn't affected, but I could imagine someone else being less lucky. Either way, the description at the participants box basically states there is a feature that isn't there or isn't working properly. it would be wise to at least remove it from the description until it's fixed. ^^