Did we ever get to the bottom of why sent PMs do not appear in the sent PM box?
It’s rather annoying. Can it be sorted please? 
Ok try this go into your UserCP profile, go to edit options, scroll to messaging notifications, private messaging the last item in that box asks you something about do you want your sent messages saved, check that box and it should save your sent messages. I think I went along time before I figured it out. Hope it works for you.
Thanks Mj, I was wondering that myself!
No prob, you’re welcome Buzz. I hope that works, I retraced my steps before I posted, it took me about a year to figure it out. :o
That seems like it will do the trick. Thanks.
Maybe it should be ticked by default…