It was me!
Yes it happened twice. As soon as I sent them, they vanished from my Outbox and Sent, and even if I hit back-page several times they didn't exist. I could get back to before writing them but not find the message itself. I checked if other tabs were open and that wasn't the case either. Totally vanished. I know TP doesn't have me blocked on PM so that's not the answer either.
Lots of other PM get through to her just fine but lately we've been writing plans for arm-wrestling contests, and ordering lots of tar and feathers. It's just really weird that this happened twice, unless of course it has something to do with our participation in the military. 
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I never give you my number, I only give you my situation.
Beatles