I've carefully uninstalled all of SketchyPhysics and reinstalled 3.6.7...
I've even checked that the button that looks like "Stop" is from an image called "rewind.png".
...but clicking the "Stop/Rewind" doesn't do a thing.
The frames keep on counting upward.
Is 3.6.7 broken... ...at least for a Mac OS X Yosemite user using SU 2014?