Yes, Hank, I believe I've had some problems with PMs.

I've sent out a couple of them recently [one one the same day as the big switch, I think], and checked the little box to notify me when the message was received, but I haven't received any notification that they've been read yet.

Of course, I'm assuming that just because the people I sent them to have been online regularly since then that they've read their PMs, but I think that's a reasonable sort of assumption to make.