kwin/plasma5 crashes with fglrx Big Desktop enabled

When logging into Plasma 5 kwin crashes everytime when using fglrx driver. I have Big desktop enabled with 2 Sapphire R9 280X cards. Two monitors with one of them connected to each card. Using Leap 42.1. However, Big Desktop is working correctly in LXDE & LXQT. Any ideas?

It crashes in Gnome 3 also.

Video driver??

Set KDE desk settings to xrandr