I have a digital glitch/pop/scratch during playback of audio and video in Watchout 6.1.6 using Motu 828MK3 Hybrid on USB. It will only occur when audio and video play together on the timeline (either separate or combined), if there is just an audio file on the timeline then there is no issue. File type, amount of channels and routing make no difference and the glitch does not appear in the same place every time but does happen 90% of the time. It does not occur in Windows (VLC etc) but only in Watchout. I have rolled back versions with no success.
On the Motu the glitch is presented visually as a spike in all the channels and audibly as a digital glitch/pop, playback resumes normally after the glitch.
Windows 8.1 pro
Asus X99-e WS
Windows is up to date.
Any ideas on what this could be?
Thanks in advance.