As soon as I set the Eyefinity group on the 3x1 monitors in Windows 10 (Catalyst 15.7.1), the mouse pointer reverses, left/right turns to up/down and vice versa.Only part of the screen can be reached by the mouse pointer, and the pointer is being shown in the wrong place.
Without Eyefinity, Windows 10 recognises the 3 monitors, and it works decently, but full screen is limited to each single monitor.
All 3 monitors are rotated by 90 degrees, so this may be part of the problem. I did the rotation in the Windows 10 system configuration, and it seems this doesnt work with the Catalyst settings. But returning to standard in windows settings and using only catalyst doesnt work either.