Hello, When you start the race with different kind of full wet tires, and you need to switch to full wet, the window for five stint you can not make the switch. You can put any type of tire there, but not the full wet. Sorry for my English writing. But I think I managed to explain the error.
I too came across this problem today in my race. Once we hit stint 5 we could not select the full wets. the option was there but when you mouse over the full wets it would not highlight nor let you choose the full wets. I did however find that I was able to use the unscheduled pit stop option to adjust the tires to full wets.
And today i got hit by this one a few times. Had to pit an extra 4 times or so because i couldn't select Full Wets, but also because i couldn't attend the race completely and manually override the 5th stint (due to the fact i wasn't at my computer, not because of a bug or something)
Bug still persists. Basically it looks like it will only allow you to grab tire compounds within the black box for pit strat. if it is outside of that box...yer screwed.
Sorry that this is still happening, we've been flatout on the service update which is coming tomorrow. Once that is released and stable we'll be looking in to things like this.