I found bug when using physics for moving object that collides with solid object.
<img src="http://dl.dropbox.com/u/17601731/forum/c2_physicbug.jpg" border="0">
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Physics behavior is not meant to work with 8directions or other alike plugins.
If you want to move an object with physics, you have to use the action "Impulse", not teleport it.
Read again the tutorial about Physics.