This issue has also now started for me.
I use Sims 3 Camera - and have done since the Sims 4 was released. Yesterday I was playing away, happily using my middle mouse button for tilt then boom! It stopped!
I have repaired the game using Origin, I have started a brand new game (moved all files out) and started fresh but the issue is still there. The issue is NOT my mouse (using the wheel in the Sims 4 still allows me to zoom) and it still works in other games.
Any one found an actual fix? Because holding the CTRL key and pressing right mouse button is really frustrating.