Choppy iTunes and Quicktime playback
Hi
Since upgrading to Mavericks and iTunes 11, I have choppy video playback with iTunes and Quicktime. It's incredibly annoying and I fail to understand why this is happening! MacBook Pro, plus Apple software - and it does not work properly!
Can anyone help????
Thanks
Giles
MacBook Pro (17-inch Early 2011), OS X Mavericks (10.9.2)