Hi there, me again!
I started a new game with the new EP, Ambitions. I immediately got a CTD. OK, so I re-booted, and tried to load the game again. Hmmm. Not there. My last game, and all the previous saves were there in the main window, but not the new one. Uh oh.
I closed the game, and went looking for the saved game in Saves. There it was. No "gamename.sims3.bad" just the new "gamename.sims3". I tried re-naming it, but it still wasn't available to play. So, I emptied the Saves file. I put every single game onto a portable drive for safe keeping, and then just took the one new game and put it back in the Saves folder. The moving of saves took a long time. I have over 14 GB's of Saves!!
Anyway, I fired up the game again, and TADA, there's the new save. Soooo, finally to the question: is there a size limit to the Saves folder? Sure seems like it to me.
Phyrie