Try mapping a plane, then go to edit mode and move the vert of the plane to anywhere you like and hit u for undo. Then press tab to get out of the edit mode and you will see all the texture of the plane gone. 
Did anyone get this ?
Yeah its a real bummer. I reported this as a bug in the Tracker last week. It should be fixed soon.
TorQ
alright, thanks
Bugs should be posted at the bug tracker over at blender.org. It’s easier to manage bugs when they are all grouped together.
Martin
I raed what you said at the others texture bug topic, sorry 