I
cannot reproduce this. Items I add to Connected Media
do persist through both closing MC and rebooting.
A few notes and questions:
1. MC does not actually care about reboots. I suspect what is happening is that when you "close" MC, it isn't actually closing, because it is set to run the Library Server in the tray.
If
Tools > Options > Startup > Windows Startup is set to any setting that includes
Media Server then closing the main MC UI (via the X in the corner) does NOT close the application, but puts it down in the System Tray in Media Server mode.
You can force the Media Server to close by finding the icon in the System Tray, right clicking, and closing it there.
2. Are you doing anything to rename Connected Media to the "internationalized" version, Web-Medien? I see in your first screenshot, that it shows up as Web-Medien. But then, in your "post-reset" screenshot, it shows in English. Any idea how that happens? When, and how, does it change from Connected Media to Web-Medien?
3. I wonder if your Library is loading Read-Only for some reason, and you checked the "don't tell me this again" box in the dialog, so you don't realize it. Can you go to Tools > Options > General > Advanced and click the Reset all confirmation messages button.
Then, close MC completely (make sure to include the Tray Icon discussed above) and re-open it. Do you get a "this will be opened read-only" message?
4. Where is the Library itself stored on disk, specifically? You can check, if you don't know, in the
Library Manager.