problems with vertex tool

[static2601]

Anyone know why im getting this problem:
Use vertex tool to make brushes, then save and close.
http://imageshack.us/photo/my-images/406/vertexerror2.png/
Open it back up and it looks like this
http://imageshack.us/photo/my-images/268/vertexerror.png/
Ive tried saving it with a new name. I've had this problem before. not sure why its happening.

 

[Fruity Snacks]

You're doing some really funky stuff with the geometry it doesn't like. You have it so that 1 corner is down, but the others aren't, it can't properly "make" that face, so it sets it to something that it can.

The simplist fix is not to do that.

 

[static2601]

Ok, I now see that im bending a plane. I can see why that wouldn't work. thanks