Yes, I've been living with both problem. I had the back window fixed while it was still on warranty, but the problem came back.
I am in FL, so I can expect all my moldings so take a serious beat in the sun. I was planning to redo all moldings before next summer.
It's mostly cosmetic, so it doesn't bother me much, except that one time I got caught in a flash rain and my back window would not come back. Try to clean all the edges with a plastic scraping tool and then use some lube as Todd suggested.