I had this exact same problem. I tried many versions of the driver without success, only disabling the dual graphics would alleviate the symptoms. I have an A10(R7 graphics) and a PCI-E R7 card, so I would have thought they would work as they had in Windows 8.
In addition to those symptoms, I had several programs crash with messages similar to this:
Faulting application name: Microsoft.Photos.exe, version: 15.803.16240.0, time stamp: 0x55bffda5
Faulting module name: aticfx64.dll, version: 188.8.131.524, time stamp: 0x55a7084b
Exception code: 0xc0000005
Fault offset: 0x00000000000c0410
Faulting process id: 0x8f8
Faulting application start time: 0x01d0db4d27856e88
Faulting application path: C:\Program Files\WindowsApps\Microsoft.Windows.Photos_15.803.16240.0_x64__8wekyb3d8bbwe\Microsoft.Photos.exe
Faulting module path: C:\WINDOWS\SYSTEM32\aticfx64.dll
Report Id: d25e158c-c345-4eb7-99f5-a5f651cf973c
Faulting package full name: Microsoft.Windows.Photos_15.803.16240.0_x64__8wekyb3d8bbwe
Faulting package-relative application ID: App
Looks like a driver issue. I haven't had any errors like you're reporting so that's good additional information. Hopefully AMD can use all this to help solve the problem. For me this issue is not a big deal because I know where the buttons are and they do still work. But, it could be causing a good number of people some headaches as in your case with the program crashes.