@tomanynote I just tested every slider I have, and they all worked. Try repairing the game in Origin: open your game library, right-click on the Sims 3 icon, and select Repair.
If that doesn't help, could you take a couple screenshots of a sim with the nonworking sliders all at the minimum, and all at the max? Put your game in windowed mode and click cmd-shift-4, then drag your cursor over the section of screen you want to capture. That way you can include the UI showing a few of the slider positions, for comparison.
Please also list the packs you've installed.