My computer with 2 monitors keeps switching sides
I have 2 monitors on my computers - 2 Mac Pros (2011) and an iMac. All are running 10.9.5. I have one monitor in each case that is the "home" monitor - with the dock and files on the desktop. All 3 of my computers keep switching the Dock to the other monitor .. randomly. Once switched, the Dock stays on the other monitor until I use system preferences to change the arrangement.
Has anyone found a cure for this problem?
Mac Pro, OS X Mavericks (10.9.3), iPad, iPhone5, Mac Pro, MacBook Pro