I've had a problem with my Mac Pro since I first bought it. I have a setup with six 1920x1080 screens (3 screens wide, 2 screens high). I've processed some nice (large) photos, so I could set them on these screens and still make it look like one big photo. I've calculated and cut out the bezels from the photos and it looked very nice. The problem though: my Mac can't seem to remember which one goes where. An example:
Looks nice, doesn't it? Yet, I regularly boot my Mac and see this:
The photos that are actually part of my background have been moved to a different screen and then there are two parts from older desktop background that have been reintroduced (bottom left and right).
I've tried removing every single folder from the background selection dialog window, and just adding the one I want (if that helped, I could live with it), but it doesn't seem to help. Every single OSX update (I've just updated tot 10.11.3) gives me a little hope that it's fixed, but it never is.
Do you guys have any idea how I can keep the backgrounds in place, or, stretch a single image between multiple monitors (preferably without third party software).
In case you wonder, the Mac does remember where the displays are relative to each other. I can move my cursor between screens without a problem.
I look forward to your response(s).
Mac Pro, OS X El Capitan (10.11.3)