I updated my MacBook Pro to Mavericks (10.9.5) and my Wacom Intuos4 had major issues in Photoshop CS6: spot healing brush lagging, brushes lagging, lasso selections closing early, photoshop totally freezing, screen flickering when scrolling with hand tool…totally unusable. I tried 3 different driver versions for the tablet…didn’t help. I tried resetting preferences in Photoshop…didn’t help. I was also using a MacBook Pro at the studio that had Yosemite installed with Photoshop CS6 and it had all the same problems. I finally found the White Window Workaround plugin and it fixed everything on both computers!!! You can find it here:
https://helpx.adobe.com/photoshop/kb/photoshop-menus-turn-white-mac.html