SetCollisionActive doesn't work as it is supposed to do ?

Hey there,

I've run again into a stupid problem. In my game... I have blocks falling down, when they hit the bottom they are getting converted to static blocks...

Here's my collision options code for the blocks:

function setCollisionOptionsToBlockField(%field)
{
	%field.setCollisionActive(true, false);
	%field.setCollisionPhysics(false, false);
	%field.setCollisionResponse(CLAMP);
	%field.setCollisionCallback(false);
	%field.setCollisionMaxIterations(2);
	%field.setLayer($GAME::BLOCK_FALLING_LAYER);
	%field.setGraphGroup($GAME::BLOCK_FALLING_GROUP);
	%field.setCollisionMasks(BIT($GAME::BLOCK_FIELD_GROUP)|BIT($GAME::PLAYER_GROUP)|BIT($GAME::BLOCK_FALLING_GROUP));
	%field.setDebugOn(5);
}


function setCollisionOptionsToWallField(%field)
{
	%field.setCollisionActive(true, true);
	%field.setCollisionPhysics(false, false);
	%field.setCollisionResponse(CLAMP);
	%field.setCollisionCallback(true);
	%field.setCollisionMaxIterations(2);
	%field.setLayer($GAME::BLOCK_FIELD_LAYER);
	%field.setGraphGroup($GAME::BLOCK_FIELD_GROUP);
	%field.setCollisionMasks(BIT($GAME::BLOCK_FIELD_GROUP)|BIT($GAME::PLAYER_GROUP)|BIT($GAME::BLOCK_FALLING_GROUP));
	%field.setDebugOn(5);
}

As you can see, I'm turning off the receive-option for the blocks in setCollisionOptionsToBlockField. I'm doing this 'cause I don't want that onCollision gets called for this type of blocks.. the static fields will receive the collision of the falling block... ok...

the static block receives now the collision like this:

function t2dSceneObject::onCollision(%srcObj, %dstObj, %srcRef, %dstRef, %time, %normal, %contactCount, %contacts)
{
	switch(%srcObj.getGraphGroup())
	{
		case $GAME::PLAYER_GROUP:
			checkPlayerCollision(%dstObj,%normal,%contactCount, %contacts);	
		case $GAME::BLOCK_FIELD_GROUP:
		    if(%dstObj.getGraphGroup() == $GAME::BLOCK_FALLING_GROUP)
		    {
			setBlockFallingSpeed($GAME::CURRENT_BLOCK,0);
			convertBlockToWall($GAME::CURRENT_BLOCK);
			$GAME::CURRENT_BLOCK = 0;
			spawnBlock();
		    }
		case $GAME::BLOCK_FALLING_GROUP:
		    echo("autch! why?");
	}
}

the convertBlockToWall converts the falling block by creating new objects etc.. and deleting and removing the falling black by calling first removeFromScene and then safeDelete... well. yeah.. then it crashes... I think this happens cause TGB wanna send the falling black the collision too.. but why ?? I turned it off !

Does anyone know why it doesn't work ??