Sorry I can't be more helpful, I don't own late night or generations.
I did have problems similar to this though with my showtime. I installed it and it seemed to be fine, but I was having a lot of glitches and decided to uninstall and re-install everything. When I got to showtime I had this problem. I contacted EA and they asked me to send the disk back. They confirmed it was faulty and sent me a replacement. However, as you are having problems with two disks, it seems unlikely that this is your issue.
If no one here has any better suggestion, I think you should contact EA for advice.