Hi Peter
I'm not 100% sure if this will fix your problem, but here are the steps to reset VLC to its default settings within the android app.
Open VLC and click on the main menu icon in the upper left corner of the homescreen. Scroll down and open
Settings, then scroll all the way down to the bottom and open
Advanced.
Now click on
Clear media database, then click on
Storage, and then click on
Clear data and
Clear cache. Here's a screenshot of that final step:
After you clear the data and the cache, VLC will restart and automatically reload your entire media library. All settings will return to their defaults.
Hope that does it for ya.
Kent F. Kruhoeffer