Try using Sims 2 Hack Conflict Detection Utility. You can Find it at.
http://www.simwardrobe.com/Under sims 2 then select programs. Scans can take a few mins., But it will let you know of any Package file conflicts in your downloads folder.
I hope you were using the "Boolprop testingcheatsenabled true" cheat code to see what might be wrong! If not you got a hack turning it on. I'd do a ctrl shift C and turn that off with the command "Boolprop testingcheatsenabled false". This will also get rid of that "error simpack # 30452 " then click delete , reset , ignore, popping up on the screen.