Bricks disappear

[Builder]

So recently I have been getting a lot of driver display errors its really annoying and yes I do have Vista. So now today I was building and the bricks disappeared I could not see them. So I reloaded and once I looked at them they disappeared again it was very weird. And before this I got new drivers I have an Nvidia GTX 260 its practically new so I don't think that would be it. But it is very weird and help would be much appreciated because this is very annoying.

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[Builder]

* Just in I just re-downloaded blockland it worked for a while then they all of the sudden disappeared again
* Random caps was in the server with me and he could still see them fine.
* When I go to other servers they look like everything is smeared and someone just took a paint brush in MS paint and messed everything up
* I have new drivers got them about 2:00 PM today
* These weird glitches only seem to be happening on BL, steam games are fine