Sims 2 Legacy Collection: Mouse Clicking Takes In-Game Snapshots

I have no idea what's going on with this game. I've had this bug since yesterday and the same thing keeps happening, no matter what I do. I cleaned my keyboard, replaced my mouse in case that was the issue, uninstalled and reinstalled the game multiple times, but no matter what something is wrong with the game. Even tried playing with the keyboard unplugged a few times, not even THAT changed anything.

I boot up the game, load into any household (or just change around settings in the menus) and I always get the same thing: The in-game snapshot function activates against my will, even if I dutifully have my other hand away from the keyboard just to prove to myself I'm not touching anything, and I get flashblinded because I can't disable the **bleep** flashbulb effect or turn off the snapshot functionality entirely. I'm worried I might get legitimate vision damage from the amount of times it's gone off at me for no reason when I just want to play my games again.

Combined with the awful bug that means I don't have any of the Premade animals in Sims 4, this has been the worst month for me with Sims products ever. If at least one of these issues can't be fixed soon, I'm not going to be able to play ANYTHING Sims on this computer.