nothing has changed to cause this. it worked, now it doesn't
this had an image of the result, nothing in the browser. Enough of that! I got it to work.
here's how: I removed Synchron.plist and Synchron Player.plist from my name/Library/Preferences. This made my presets appear, but none of the actual libraries were seen.
Now it's rebuilt some preferences. Not any good, but moving on.
So, I *put back* Synchron.plist - there is no rationale here, just being methodical - and checked it again, and now both show. I don't know what this means LOL (apparently the at.co.vsl.Vienna Synchron.plist contains the libraries locations while at.co.vsl.Vienna Synchron Player.plist contained the path to user presets. It no longer does but this is working. The latter was corrupt, the rebuilt property list looks quite different than the file in trash.)
running Uninstall Synchron Player did not get rid of [my user name/] preferences so it did nothing for my situation