Thanks for the responses! Listener, with respect to your questions:
Some questions:
1. On what computer were you making the tag changes?
I am making tag changes on the computer running MC (my laptop)
2. Does the MC library database reside on that computer or does it reside on a different computer running MC as a library server?
The library database is on my NAS. I hope this is what you mean. No other computers or drives are part of the chain.
3. What fields (tags) were you changing?
Album Artist for the most part. Sometimes Genre.
4. What music file types are you editing tag values for?
FLAC
5. Where are the music files stored when you edit them? (On what computer?) Where are the library (database) files stored?
All files are stored on the NAS (WD MyCloud). NAS is connected to the wireless router (Fios) and the rest of the system is over wifi.
6. Can you post a screenshot of the screen as you editing a tag value and then a screenshot showing the unchanged tag values after you exit MC and start it again? I will try to do this (never did it before, but I bet I can figure it out).
Looking forward to any advice you can provide.
Thanks for the useful answers to my questions. Some comments:
1. Someone suggested that you might be making changes on a computer where MC is running as a client on one computer accessing MC running as a library server. This appears not to be the case. We need a different cause for your problem.
2. and 5. You may not understand what the library database is. When you rip CDs or import files, MC enters the file name and the tag information in a database. This allows it to respond very quickly when you browse to find a file. The library database may also contain some fields for which there are no corresponding tags in the music files themselves. If you are using the default library, it is probably stored in a folder like c:\users\[your user name]\AppData\Roaming\Media Center 22\Library.
3. Note that there are two album Artist fields. The Album Artist (Auto) field is calculated by MC. You should be editing the plain Album Artist field.
4. OK. Flac is a good choice with full support for tags.
6. I asked for the screenshots for a good reason. Sometimes when you report that the changes are gone, you are jumping to a conclusion based on what you see in a particular point in MC. It is very common for new users to misinterpret what they see on the screen.
It will clarify what's going on to see where you were in MC when you were editing tags and where you were when you concluded that the changes you had made were gone.
A screenshot is a copy of what the screen looked like at a point in time. To get it, press the Print Screen key which should be above the regular alphabetic keys on most keyboards. (You can hold down the shift or Control key as you press Print Screen.) This places an image in the clipboard. Now you use an image editing or paint program to capture the image from the clipboard. In Windows 10, click on "All programs" in the start menu, then on "Windows accessories" and then "Paint". Use the paste command to retrieve the image from the clipboard. You can crop the image to remove the parts of the screenshot you don't need and then save it in a location you can find again with a name that you can recognize.