Need advice. Upgraded to yosemite on my mid 2011 iMac.I'm having tons of problems: mainly Photoshop CS6 keyboard shortcuts for brushes, zoom even Save undo etc stopped working as well as severe lag in processing using brush tool. I use a Wacom intuos 3 tablet which i have installed latest driver. I have now installed the white box plug-in that has helped the Brush keyboard command, but now all kinds of new errors are occurring: in utilizing the eyedropper too, l the color picker. i get a window saying: "could not complete your request because of a program error" (!!!) this has rendered my Photoshop CS6 completely unusable [and i'm on deadline!]. Any advice would be greatly appreciated! coul it be Font explorer pro which has been closed during all these scenarios. could it be the 3rd party custom brushes i purchased that are highly regarded and super crucial to my artwork? Is there any way to pin point the problem without uninstalling things? I'm just stuck. Please help!