I had the glitch where I built a house, added a Sim and when I tried to go back the house was still blinking and I had to add more Sims to open the house. Finally at level 22, It had stopped blinking and was fine although I had 7 Sims in that house and earned alot of LP's. I just built another house at level 23 and the same thing has happened. I am at 24 and I have to keep adding Sims to go into the house. I keep making them all plant and it add's to my total money. I also can't add LP's because of this.