I am seeing flickering and corrupted nameplates in the new Final Fantasy XIV DX 11 client when running with CrossFireX enabled. I have attached a screenshot of the issue. A nameplate can be temporarily fixed by moving the camera such that it is out of view, and then bringing it back into view.
I have a 2x290 CrossfireX setup. All Catalyst settings are set to default, except "Enable AMD CrossFireX for applications that have no associated application profile", which is required for Crossfire to function in the FFXIV DX11 client. I have tested with 15.4, 15.5 and 15.6 drivers. My dxdiag is attached.