"Jesun
My fix is just when it does that Charlie, just alter something in your setup and switch it back. The save button turns green again.
First time around it was caused by sessions, that the refresh should fix.
Now it seems like its something to do with the time for the laps [when it says car on track] you cant save it until the time comes up N/A , or ur 5th run though yeh, just adjust something +1 then -1 and save will go green