Yes - for some time now, however the notification of a PM isn't working. You have to watch for the wee red light in the Messages box next to your username at the top of the page.
Nope. No errors. It happens most often when I respond to a PM. I respond and everything looks fine but I don't see it in my sent folder. If I try to send it again, it still doesn't send. At other times, I can initiate a PM to another user and it seems to send fine and then I see it in the sent folder. Very random so far.