Problem with the physics, specifically through the tutorial 09

Hi all,
I have a problem with the physics, specifically through the tutorial 09.
If I compile and run all goes well.
If I edit the .blend and remove such object "plane" (the ground) and I put other plane with the same physical properties of "static" and "actor" after exported and when I compile the new plane appears, but the cylinder (player) passes through it and still falling.

Any idea that I'm doing wrong.

Thanks to all

Make sure you reset the transformation (CTRL+A)

And I suggest you to review the video tutorial06...

OK. Thank you. Forget press Ctrl + A.
Everything is fine now.