When I use the node “Set collision enabled” to turn of the collision of a object and that object uses physics those physics gets turned off and can’t be set back on. So a object that is supposed to fall will just be freezed.
Using 4.6.1.
Hi Davision,
This doesn’t appear to be a “bug,” but maybe the way you’ve set it up.
Physics will be disabled anytime you disable collision because if there is no collision there is nothing for physics to react to.
As a simple test (like I did) you can set up a key press in the level BP to disable collision and a key press to enable collision. Just make sure when using the set collision enabled that you’re assigning it the appropriate channel otherwise it won’t work.
Thanks!
Tim
I made it now with “no physics collision” which then works in my case, it keeps falling then.
“Physics will be disabled anytime you disable collision because if there is no collision there is nothing for physics to react to.” It wasn’t like that in UE3, in UE3 it was still affected by gravity. So you could simply let stuff fall through the floor.
No you’re right. I somehow over looked that option when I looked at the drop down. 
Using the No Physics Collision is the way to go to have it fall through the floor like you need. Although, my original statement is correct that without collision on the mesh you will not have any physics simulations, though no physics collisions will still allow you to use gravity for the mesh.