Hi, VLC is ok, it's just that randomly, for no apparent reason, the volume OSD will disappear in the middle of changing the volume. There could be, but I haven't really found any real correlation between changing window size or doing anything that would trigger this other than just changing the volume. It seems random. I always use the trackpad (two finger swipe up/down) to change volume.
Also, I am close to murdering a baby if VLC will not already, after all these years have, have a checkbox in the preferences somewhere to save window size and position upon exiting. Also, I don't know how many times I've requested this over the years but also an option to have VLC window only "float on top" when playing. When paused I'd like to be able to have other windows on top. Hence why I paused the video in the first place! Because I want to temporarily stop watching the movie and take care of something else...... Thank you.
vlc 2.2.6
macos sierra