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As I drag the window back and forth between the external display and my laptop display, the previous state briefly shows. When I drag it to the external monitor it looks ok for a split second in vertical bands that refresh to solid black. Same when I'm dragging the window back, the window remains black on my main laptop monitor until it refreshes back to normal, in the same vertical-band fashion. The frame of the window, including rulers looks ok, but the image area, including the canvas color turns black. This blackness can be captured in a screenshot.
On the PNG that is working, I do get some black as the image resizes between displays (stays at 100% but on the lower res monitor it doubles in size). In CS6 the image does not resize, the % changes (16.67 on external, 33.33% on laptop) and remains approximately the same size.
Perhaps this is more of a bug than something I can do anything about, but I am unable to login to Photoshop.com (someone else has already posted about this issue there, 5 days ago, not responses yet), I get an "it is no longer possible to create an account" message, even though I already have an account.
Thanks.
There is an option under preferences-performance to use the graphics processor ( in my MBP 13, an Intel HD 3000 GPU ).
If switched it of, hit ok, then switched it back on. Everything seems to work now.
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I restarted Photoshop a couple of times to get it working again. OS X 10.9.5, Thunderbolt display and MBP 15"...
So, annoying.
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So this thread was started in June 2013 and it's still not fixed in June 2015? Is there any word on when Apple is going to have a fix for this? I just updated to 10.10.3 and PhotoShop CC 2015 on my early 2011 MacBook Pro and ran straight into this problem. I'm not really interested in turning off GPU acceleration or going through mystical incantations or special window order/startup procedure to just do the work that needs to get done.

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This problem came back for me after installing Photoshop CC 2015. Very annoying when I reconnect MBP connected to my Apple Thunderbolt Display multiple times each day but cant use PS on it.
This workaround seems to help, at least for now: Restarting PS with the second monitor plugged in.
Image on second monitor goes black | Mac OS
Hope a permanent fix is coming from Adobe/Apple.
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Update: The OS 10.10.4 update fixed the problem for me. I have not updated my PhotoShop CC 2015 since jumping on this thread. It is also the most up-to-date at the 2015.0.0 release.
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This worked for me! A very annoying problem I didn't know how to approach it for a few days until I read this.
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I've had the same problem. Fully updated Macbook Pro (OSX & Photoshop CC). Non-Retina Display.
No fix: Un-checked graphics box etc, under Preferences>Performance did not do it for me.
FIX: Saved files. Re-opened PS CC on the external monitors application bar.
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None of the posted fixes worked for me.
What worked for me was to disable separate spaces in the mission control.
Hope this helps others running Yosemite!
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I just upgraded to CC 2015 and it started happneing to me for the first time, every minute or so the photoshop drawing board goes black, if I drag it to my Macbook Pro monitor the image returns.
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2017 and I now have the same issue. It's super annoying, and has apparently never been fixed. Here's a video. MAC 10.12.6, Wacom 27HQ and a NEC Multisync PA271W
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Same issue on a TinkPad T406s Lenovo, Win 10 Intel i7-6600U CPU and Intel HD GPU 520. Fixed with unchecking use gfx gpu.
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