The expansions I have are Ambitions, Generations, Supernatural, Pets, Late Night, University Life and Into The Future. The stuff packs I have are Outdoor Living Stuff, Master Suite Stuff, Town-Life Stuff and High End Loft Stuff. I am also playing on a mac with OS X Mountain Lion.
My friend gave me the Seasons expansion to download and then I uninstalled and reinstalled town-life stuff so that Sims would ask me to enter that disc when I start playing.
Every time I pressed the play button on the launcher the message "unhandled page fault on write access to 0x0000001c at address 0x101eb149. do you wish to debug it ?" would show up. Using some advice I found on other forums, I got the game to start up without this message showing. This also meant I had to uninstall seasons.
Now when I play the game, none of the content from any of the expansions show up apart from late night and ambitions. As well as that, there is a lot of invisible clothing and hairstyles e.g. when i put the invisible trousers on my sim, legs disappear. This happens regardless of whether I have CC or not. This was an issue I had months ago but this, as well as the game showing game tips when loading instead of the object-finding game, has come back.
This next change as annoying but may be relevent. The large bar at the bottom which showed moodlets, needs, wishes etc. is a lot smaller than usual.
I have some crash reports too that I may attach if you need them