A void between .com and .org
This issue was reported to support@musescore 4 days ago and they sent me back to the handbook and .org forum (Support and bug reports).I finally fixed the problem myself, but it could have been solved in 4 minutes. What happens in "manage audio sources" is within the purview of .com, not the .org forum where they sent me. In 10 months here, this is the first time I could not get help.
The problem was a piece on my page with an audio source from youtube.
The sound is fine on youtube.
The sound did not play on my page. I entered it again and it played, but without the scroll, but THE DEFAULT remained " an error occurred". I did not know how to change it because the 3 dots to the right (in "manage audio sources) did not function. I added more audios, for a total of 5. This software is new to me and I finally figured out how to delete "default" on the bad audios.
The issue is this: why did they send me to the forum and/or handbook? This is a serious gap which can result in more discontentment. The answer was a simple one. The folks at the forum here do good work and should not be stuck with matters on the .com site.
One question remains for anyone who knows: Does the red delete box next to the blue save box in "Manage audio sources" delete the unwanted audio (as I assume)? or the score?