I just updated to the latest version of r36 and I noticed two bugs.
1. Whenever i launch the Preview the screen is blank until I resize the screen.
2. Collision between two Physics objects is not constant and can also stop completely.
Below is an example project that will demonstrate the bug.
I'm using a Platformer with a Physics box inside in order to allow physics collisions but still have a Platformer.
https://www.dropbox.com/s/18daaxngvw817 ... r.c3p?dl=0