Well I got a new graphics card last year for christmas. The problem has been occuring since probably I installed mm2. I thought it was maybe dls because I forgot to unistall some. I finally got fed up and uninstalled my game. I was reinstalling stuff until I tried to reinstall DD2, it kept saying I had to use the AA disk. So I unistalled and reinstalled it again this time w/o dd2. It was working fine and I made a "aquriam(sp)" in mm2 and that was the thing I had the most problem with and it worked. So last night I got on to play and everything was working fine and I started to make an african area, then suddenly the border fencing started to blink and had no colums only it didn't last so I thought it was ok. I continued to play and it happened again. I went into zookeeper mode to see if it would happen in that mode it didn't, I then walked into my "aquriaum" and the elevated platform that acted as the roof started to blink and disappear. I got out of zookeeper mode and it didn't happen. I told my dad and he said close out of it. I tried to place a zookeeper and it shut out on me for no reason. My graphics card is an ATI. A couple weeks ago my dad took the computer into compusa to see if they could find the problem. they said the graphics card might be broken, it wasn't. They upgraded some stuff and we took it home.