This has happened many times to me and is getting very annoying.

It doesn't happen consistantly, but sometimes when I try to place a block in the map editor, my driver crashes. The screen goes black for a few seconds, then it comes back and says its crashed and recovered, but then it does the same thing over again if I move my mouse at all while that block is selected. It seems to always happen with a narrow road block placed on the ground. For example, today I tried to place a normal "narrow road" block on the ground level and my driver crashed repeatedly. I restarted my computer and went into the editor again and tried to place the block that merges the narrow road blocks with the slanted concrete bank turn block (not sure how to describe it so here is a picture), and the same thing happened again.
http://dl.dropbox.com/u/122831723/Driver%20crash.png
This has also happened with the new tree block with the narrow road going through it. It has only happened with blocks that have the narrow road in them somehow (either has a narrow road block in it, or connects a narrow road block to concrete, asphalt, etc.), and only when they are place at ground level.

This has only happened within maniaplanet, and in the editor. I have a very new graphics card/driver so I doubt it is broken, and all of my drivers are fully updated.
Again, this doesn't happen every time that I place a narrow road block, but I would still like to know what is going to see if I can fix it somehow. I would like to know if there is a specific reason that this is only happening with these blocks, and what I can do to prevent this from happening.
Zack11