Clipping tool cause holes

[Kamilczak020]

when I used clipping tool on my "ground" and ran my map, I saw this:
[IMG]http://img405.imageshack.us/img405/3340/screenkratka.png[/IMG]
Pls help

[DanielPinoy]

Those are displacements right?

[Firegod522]

Have only the top face selected when you make a displacement.

[comet1337]

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