Niels, can you remember when you logged the PIREP? Did it say it was successfully submitted? Because I had this problem too, and it was because of a short break in the internet connection half way through. When I logged the PIREP, I had to scroll down the window to get the big, red "Attention!" box - if I hadn't, I wouldn't have known that it couldn't be submitted. You still get the hours for it, though, which is why it appears in the timetable but not in PP.