I've had 2 stays in the last 2.5 months not post. Both were DC area FS hotels. It's really annoying checking on it afterwards, waiting the 10 days, filing a missing credit form, not getting a response, calling the platinum line, etc. And, for one, the reservation came with 2500 bonus points which still haven't posted (it's been over one month now). I called and they asked that I email my reservation (which shows the bonus); they said they'd credit it once they received that. Nothing. I got so annoyed I wrote a USPS letter and included the reservation print out; that was about 1.5 weeks ago, and still nothing.

What a pain. Never had any of these issues and now 2 in short order.