I don't know whether this is a problem caused by VLC or something else but it is occurring on two separate Macs, one with OX X 10.10.3 and one with OS X 10.10.2 - both have VLC 2.2.1. The Mac with OS X 10.10.2 has hardly any other software installed - pretty much just what it came with, Safari, Mail, and the iLife and iWork apps.
It happens with .avi, .mp4 and .mkv files - basically, every now and then, the screen with go grey as if the data from the keyframe has been lost and then only the moving parts are visible until the next keyframe. Sometimes this happens several times in a few seconds. It doesn't appear to be a problem with the video files as rewinding and playing that part again is always fine - besides, it would be a bit of a coincidence if all my videos from various sources had the same flaw.
I first thought it might be caused by Mail's automatically checking for new messages and taking up CPU or something similar but I have tried quitting everything else without any improvements.
My Mac (OS X 10.10.3) is a 2.66 Core 2 Duo with 8GB RAM and 400+ GB free space. I am pretty sure that the other Mac (OS X 10.10.2) did not have this problem at all until VLC was updated to 2.2.1 about two weeks ago.
Has anybody else got this problem? Or is it just the two Macs which I use?