AMD Graphics stalling on 3 Macs with latest El Capitan udpate

I'm having a problem on three different systems. 2 MacPro towers and a MacBook Pro. All running the latest El Capitan with the latest updates.

Since the last update, all systems are having trouble with the AMD graphics cards causing temporary hangs and generating errors in the system log.

System 1: kernel[0]: stalling for detach from AMDCypressGraphicsAccelerator

System 2: kernel[0]: stalling for detach from AMDJuniperGraphicsAccelerator

System 3: kernel[0]: stalling for detach from AMDTurksGraphicsAccelerator

When these errors are generated, the system completely pauses as if locked, then comes back until the next error.

Not sure what is causing this and a google search comes up with nothing for the "stalling for detach" message.

Appreciate any help.

Best,

Chuck