Found it - I think!
But do NOT understand how it could happen.
Problem was not the preset's permissions, but the fact that it had been set as READ ONLY.
For sure NOT by me: I didn't even know that such file existed.
After your question I experimented with other presets, found out that from within the AppData folder THOSE could be changed/saved.
Only 2acc97f0-bd50-476a-8f2a-680eedca8985.ASR Preset.xml could NOT be saved and the reason was given: READ ONLY.
So I removed the checkmark, tried new changes, and now it seems all ok.
It was a bit of a detour, but thanks to your suggestions and question I found the cause of the trouble.
Thanks a LOT!
Ciao!
Wim
PS:
If I may bother you with a new (recent) issue, can you tell me if you have the sorting problem as me:
The result of a click on the column header DATE ADDED does not give the expected result. It is confusing and messy. If I add 4 cd's of the same opera album ONE BY ONE in the order 1-2-3-4 the DATE ADDED result downwards should be 4-3-2-1, but it is not. Can be 2-4-3-1 or 3-1-4-2 or anything. Looks as if the sort order feature looks at the DATE only, not (correctly) at the TIME.
And one or more of the 4 cd's can even be displayed BELOW tracks that were added earlier in time...
Is that the same with you?