My monitor is running at 3840 x 2160 30hz since I upgraded to the 17.9.1 software. Before this, if I set my Windows resolution to 1920 x 1080, that's what my monitor would run at. Now, no matter the resolution I set, it seems to be stuck. This happens on my installation of Windows 7 64 bit and Windows 10 64bit. I have and XFX R9 390x. It isn't the monitor because I hooked it up to the Xbox 360 and it runs in 1080p. Also, when starting up it doesn't begin until the Windows login screen appears.