Started recording a series of videos, testing playback each time using Windows Movies & TV version 10.21111.1051.0. No problem with the first few, but suddenly subsequent MP4s had problems - audio and video appeared to be accelerated, with sound and video distorted. Checked the files using another player with same results, making me thing something changed within ManyCam. How to troubleshoot?
Found the issue. I had switched the “save to” location for recordings from a local drive on computer to a network drive on AWS. Switching back to local resolved the issue, apparently due to network latency issues.