Multiple Displays keep switching

Hi I've always ran a dual display with my mac pro and no issues now when I reboot sometimes(appears to be random) the displays switch and I can't figure out why and it's driving me bonkers. Sometimes I restart the computer and it's fine sometimes not. The arrangement changes and the background also changes is very bizarre, at first I thought they might be mirroring but this isn't the case either.
Any advice much appreciated.

Mavericks' behaviour of dual screens has changes and now separate displays can have separate spaces,.
This allows the Dock and Menubar to be used on either display as required.
To move the Dock, it must be set to the bottom of the display and move the mouse cursor to the bottom of the display that is not displaying it, and then 'dig' down and the Dock will disappear from first display and pop up on the other
To revert to the Mountain lion action of an extended display, goto System Preferences > Mission Control
and uncheck Displays have separate Spaces.

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