When this happens to me, I go save as, give it a new name, close out of the computer all together and log back into the computer.
Then I go through the process of cleaning the caches of Sims 3 (look under sims 3 technical help for what to do in this process) and then go into the game and open up the saved game. The problem seems to fix itsef.
Of course,
@lahaygood if this is happening to you in Sims 4 rather than Sims 3, i've got no idea, and if it is Sims 4, I suggest you try posting on the relevant sims 4 board.