I've been playing with it for small amounts of time throughout the day today with no problems, but this evening I have several.
After trying to click on the Matches tab from the main screen:- (Possibly to do with deleting a stadium?)
After clicking Load previous line up:- (Possibly also to do with deleting the stadium?)
At the end of a match (where I haven't loaded a previous line up):-
Sorry if I'm just being thick (as usual), but they've all hit me rather at the same time