Potlayer - CPU usage fine but slight tearing

Hi

Have used Potplayer on my Acer Revo for a couple of years for HD MKV playback without issue.

However I am now getting occasional picture tearing, mostly in fast moving scenes or when the camera pans.

Tried reinstalling Potplayer with latest version and the issue persists.

CPU usage fine at ~ 30% and DXVA enabled. I use a wireless dongle on the Revo as my set up is controlled via iPhone.

Any ideas what's up?
Russ