This is a user to user Forum, so you are not really addressing Adobe here, even though some Adobe employees thankfully have been dropping by.
Does turning off »Use Graphics Processor« in the Performance Preferences and restarting Photoshop have any bearing on the issue?
Apple is aware of the video driver bugs introduced in MacOS 10.10 and is working on solutions.
Turning off GPU drawing in Photoshop should avoid most of them.
But if you need the GPU features in Photoshop, you may need to downgrade to a more stable version of MacOS.
I have not tried turning off anything as i am unfamiliar with those settings, after i issued the post i did another update check and there was another so have downloaded that but haven't been able to see if it has made any difference,
Adobe contacted me but once they asked for my various codes they told me i had only a limited time copy and asked how much i paid for the CS6, i told them i paid about £180 from memory as it is the teacher and student edition bought formal store at the same time as my Mac plus i have used this fine from Jan 2013 right up to Jan 2015 without a single issue, they then told me to uninstall to produce and re install and assured me it will work fine, never asked me to update anything or adjust any settings, i actually felt very disappointed with them. (i have since found my paperwork and paid £158 and got the code from Adobe after sending in teacher payslip.
Thank you Chris, it is good to know Apple are aware etc, as my reply to c.pfaffenbichler i have not been able to try any setting yet as am away until the weekend.
oh also Adobe told me to tell apple CS6 is not working as i bought it from them...i am pretty sure what the staff will say for something i have had for over 2 yrs.
I did do a system check on the Mac which found no faults at all.
i take it the CPU is the Graphics Processor? sorry i really am not familiar with systems just using the programme.
The GPU (Graphics Processing Unit) is the chip at the heart of your video card.
I turned off the GPU and great news is I think it has sorted the issue, I only spend 30 mins on Photoshop but it worked fine.