Inverted colours after unblanking screen.

This doesn't happen all the time but on occasion after the screen unblanks and presents the lock screen i get inverted colours. The system seems to be working ok and a screenshot i got showed the right colours. A reboot fixes this.
Any ideas where this can come from?? It started happening about a month or two ago and i don't see anything in the logs.
Is it the DE (doubt it), Card drivers (suspect it), hardware (hopefully not)??
I am on E17, radeon FOSS.

chrostiffer --
Go here:
Apple icon (top left of screen) double click to System Preferences.
Open up Universal Access (bottom of that pane). Go to display, and make sure the dot next to
"Black on White" is selected, not "White on Black."
The keyboard shortcut is pressing the Apple/Command, Alt/Option, and Control keys all at the same time , along with the number 8 key.

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