Crossfire issue - scrambled Wndows

Am I doing something wrong? I have 2 XFX r9 270x in crossfire. I ran Linux Mint for 2 years with no problem with a single card. When I boot a Linux distro I get scrambled app windows. The pic is PinGuy live boot. The square in the middle is gParted. On the bottom is Docky. The top middle is a weather widget. If I boot with the 2nd card power unplugged or the crossfire bridge removed, it works fine. I tried to installing the proprietary AMD drivers & it's still scrambled. It does the same thing with Mint Cinnamon 17, Ubuntu Gnome 14.04, & Deepin 2014 final. Crossfire works fine in Windows. I really don't like Microsoft forced telemetry, & I'm ready to go back to running Linux as my main OS with Windows as my gaming platform. Any help would be sooooooooooo appreciated.

Came across this:

Not your graphics cards, but may give you some ideas towards a solution.

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Thanks,,,I'll check it out. I have used Linux off & on for over 10 years. I quit using it when I got my 2nd card & ran into this problem. At the time I didn't have time to work it out. The whole Windows 10 SE (Spyware Edition) has got me really wanting to jump back to Linux Mint as my main OS.