I faced strange issue or bug, I don't know.
When the box with 8Direction behavior collide the Solid box, first one shifts by few pixels.
I don't understand why it happens, may be someone know?
Here links to capx file and video demo
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In your capx, the grey box does not have "solid" behavior. I'm not sure what your problem really is. It has 8 direction behavior, so it can easily move off by one pixel in any direction if using touch. When I use a keyboard, it works fine.