Sims 2 Problem - Left clickling

The problem: Whenever I play the sims 2 pc I cannot issue commands to my sims, the game simply will not let me. The command box stays up for about a half a second and then vanishes and continues to do this. I did have custom content downloaded (which I deleted to see if this would fix the problem, but it did not) and I have also tried to uninstall the game and then reinstall it again, but this also did not work. I suspect that this may have somthing to do with the custom content since it never did this before. Anyone have advice?