Initial installation video desktop problem...

[linewire]

Hey all, I just installed LMDE and love it. Supports my 3 monitor setup right out of the box which is excellent!
There is just one problem, there is a pink stripe on the side of 2 of the desktops and not sure why?

I have the monitors setup like below where the ' | ' is the pink stripe (about 2-3 pixels in width)
[| 1 ] [ 2 ] [| 3 ]

Any ideas on how to fix this?