I actually constantly have to go and delete those cigen and cache files....Many times my game won't start if I don't. It used to happen every single time before Pets came out, but it is a LITTLE bit better now, lol. (I can't imagine how those who are computer illiterate would have ever known to delete those...so, I'm sure EA got a lot of cries about "my game won't starttttttt!", lol)
Anyway, it isn't fixed with the deletion of those corruptible files, but I will continue to change their appearances everytime I see the problem and keep my fingers crossed that the problem will just disappear!