Thanks Ashley! Is works like a charm!

I removed solid and platform then add physic and overlap at offset and is works!

This thread can be closed :)

Also, if you really need to use the solid behavior, pin it to the player.

You can see it in live and working, plus, download the CAPX, just clicking on my signature.

I want the red box able to stand on blue box in starting of layout

In game play, when red box falling and landed on blue box, blue box destroyed.

blue box and red box must have gravity and solid

I am stuck if not using platform and solid behavior together

You should not add the 'Solid' behavior to objects with the 'Platform' behavior. They are not designed to work together and this probably causes the problem. If you remove the solid behavior from the platform objects, it seems to work OK.

I am stuck here without using solid and platform behavior

The reason i use platform and solid because conditions i wanted are:

-blue box destroyed only when red box fall on it

-red box may stand above blue box in starting of layout

I simplify the problem in a capx

dl.dropbox.com/u/48828497/onLandTest.capx

Based on the event logic the blue box at right hand side is expected to be destroyed when red box onlanded and overlapping with blue box but it is not...

Tested in r95 and r101 still the same problem

I adjusted the gravity and max fall speed of red box, the logic sometime works but sometime not.

Is this a bug? Or i am using wrong method?

Addon:In game mode, I keep pressing F5, sometime abnormal behavior happen, both red box blew away..