Resolve/FCPX playback issues w/ new Mac Pro

when I have both FCPX and Resolve open on my new Mac Pro, my playback is glitchy in both programs. In FCPX, I get black frame flashes. In resolve, it glitches out w/ neon colors and won't give a clean export/share.

Any ideas what can be causing this?

My Mac is driving a NEC 272w via a displayport> mini display cable.

Thanks!
Kyle