Couple issues I ran into with Version 3.0
First, loses its file association to play MKV files, at least for me. Previously with 2.2.8, MKV files were set to open with VLC by default. After installing 3.0, that association broke, In Finder, double clicking on an MKV will not launch VLC. Right click on MKV file in Finder and select Open and Open With.. no longer show VLC as an app that can open MKV. Tried to reset file association using the two usual methods 1) In Finder, Open With then 'Other..', but in the Finder dialog window, VLC is greyed out as an app that can handle MKV, so you can't select it. 2) Tried 'Get Info' on a MKV file, select Open With, VLC gone from list of apps, then try Other... same thing, VLC is greyed out in the Finder dialog. Appears VLC is not registering itself with macOS as an app capable of handling MKV. I reported this to VideoLAN.
Second, when set to resume playing at previous time mark of a video when you last stopped viewing it, appears broke. It always jumps to the time mark saved when the video was last play in VLC 2.2.8. For example, let's saly you view a video in 2.2.8, and stop watching at the 20 min mark. If you reopen in 2.2.8 it will resume playback at 20 min mark. Open the video in VLC 3.0, jump to a different time mark in the clip, like the 40 min mark, stop. Reopen, VLC 3. 0 should resume at the 40 min time mark, but instead resumes at the 20 min time mark of when it was last opened in 2.2.8. Apparently when quiting, it is not refreshing the time mark of where you are at the video in the metadata it stores for each clip. So when you restart, it reloads the same time info from metadata that was never updated. Reported this one as well.
You know the old saying, be wary of .0 (dot zero) releases.