Quicktime frame controls do not…: Apple Support Communities

Grey Podder has the answer. Thanks Grey!
I noticed the same problem. Did you use a Terminal command back in Snow Leopard to disable the rounded corners in QuickTime X? I had done that, and returning it to the default fixed the unresposive controls. Try copying and pasting the following into Terminal (without the quotes) and pressing Return:
“defaults write com.apple.QuickTimePlayerX MGCinematicWindowDebugForceNoRoundedCorners 0″.
via Quicktime frame controls do not…: Apple Support Communities.
