Hello
Corona Composer is not displaying the animation timeline and physics does not preview (eg box falling under gravity) . This is happening with :-
Version 2015.2731 (2015.10.5) and Version 2015.2791 (2015.12.17) running on a MacBook Air OS X 10.11.2
On an old Version 2014.2511 (2014.11.18) displays timeline and previews animation and physics correctly.
Any suggestions would be welcomed 