It may be be me, but I think there are a lot of glitches in this pack. I haven't had a lot of them happen at the same time or quite a bit in the same game, but enough in my experimental games that I figure, and this is a guess, not tested, that there will be two or three over course of time. Depending on how bad they are, how much they affect your game, what you are playing for, such as for me a personal legacy, it can be oh well, that is life, or enough to end the game and start over again.
Don't know if that helps, any, but in real life we always have a monkey wreinch tossed in occassionally, so I figured in sims it's going to happen. Sometimes I want to know if it just my game doing this or is it a problem everyone faces.