Re: No degree
If you saved before the ceremony started, that shouldn't matter. I've done that before and it didn't make a difference as to whether my sims got their diploma or not. It does matter on the photos. Diplomas always come later around 6 PM as I said before. Not connected to the ceremony. You get them regardless of whether you go to the ceremony or not. I have found that if I send more than 2 sims to a ceremony, most times, one of them won't go in to the ceremony and won't get the photo. Saving after the sims arrive outside the venue and before the ceremony actually starts is a good place to save so if a sim in your party doesn't get the photo, you can reload and try again. Sometimes it has taken several reloads to get photos for all the sims if you send 3 or 4 at the same time. I have never been able to get photos for more than 4 though. And that took several reloads even then. So now I set my sims up so no more than 2 graduate at the same time. I like to play 8 sim households in University. So I set them up so I have 2 freshmen, 2 sophomores, 2 juniors and 2 seniors in those households so all of them can get the photos.
If you haven't got the diploma by midnight of the day of the graduation ceremony, then in all likelihood, there is something else wrong. I have gotten multiple acceptance letters before and that hasn't had any effect in my game other than having 2 (or more, I got 3 once) of them in the sim's inventory. Those are things you don't need any more once you've been accepted and started a term and can be deleted if you want to with no risk. It is odd that you got them after finishing all the classes though but not something I would think indicative of a glitch or bug.
Hope this helps.