Every so often I get this weird effect on sandbags.

Plus, when I load any map, parts of the terrain will disappear. Sometimes holes will be inside buildings, and I can see right through them.

Often, in the TV station on Sharqi or Warlord, I get this effect
Any ideas as to what is going on here? They are not permanent, and often go away as soon as I see them. All except the light bulb one.
Daggoth

Plus, when I load any map, parts of the terrain will disappear. Sometimes holes will be inside buildings, and I can see right through them.

Often, in the TV station on Sharqi or Warlord, I get this effect

Any ideas as to what is going on here? They are not permanent, and often go away as soon as I see them. All except the light bulb one.
Daggoth