I recently have developed a problem with my Sims2 game. I have all of the EPs to date. My problem is that I am now unable to add doors, windows, arches, or just about anything for that matter to my lot. I keep getting the message "Must be placed on center of tile." I have even deleted all of my custom content (after backing it up this time

) and tried to use the Maxis (read crap) defaults. Even they don't work.
My problem is further compounded by the fact that all of my EP's are digital downloads, meaning that I can't simply delete and reinstall.
Any help, cheats, or global overrides that would allievate this problem would be greatly appreciated.