Hi there! I understand that after using LibraryThing on your PC for 15 years, you're now facing an issue where new additions aren't showing up, and the covers have been reduced to just GUI elements. Let's get to the bottom of this together.

To clarify first:
1. When you say “new additions will not show,” do you mean when you add new books to your catalog, they don't appear at all? Or do they appear but without covers?
2. By “covers reduced to GUI,” do you mean the book cover images are missing or replaced by some generic icons?
3. Are you using the LibraryThing website via a browser or a dedicated LibraryThing app on your Windows 10 PC with a WebKit-based browser?

Knowing this will help me narrow down the steps.

In the meantime, here are some initial steps we can try:

1. Refresh and Clear Cache: Sometimes images or new entries don’t load properly if the browser cache is outdated. Try clearing your browser’s cache and cookies. In WebKit browsers, you can usually do this via the settings or preferences under Privacy or History.

2. Check Connectivity and Login: Ensure you are properly logged in to your LibraryThing account, and your internet connection is stable. Sometimes not being logged in fully can prevent new data from showing.

3. Try Viewing Your Library Online: Log in to your LibraryThing account directly on the website and see if your new books and covers appear there. This can indicate if the issue is local (your PC/browser) or with the account syncing.

4. Check Cover Upload Restrictions: Occasionally, LibraryThing applies limits or maintenance on cover image uploads or changes. For example, large cover images over 10MB or temporary cover editing shutdowns may prevent covers from displaying properly. If new covers aren’t showing, it might be related to this. Let me know if you tried to upload covers recently2 3.

5. LibraryThing Site or App Status: There have been reports where cover images vanish or don’t load due to backend issues. Check LibraryThing forums or site alerts to see if there’s an ongoing problem impacting covers or newly added books1 5.

Depending on your answers, we can dive into advanced steps like resetting your local app or looking at specific display settings on your PC.

Could you please tell me a bit more about how you add new books (manually, upload CSV, scanning ISBN, etc.) and what exactly shows up or doesn’t on your screen now? Also, any error messages or unusual behavior you notice would be helpful.

Looking forward to your reply so we can fix this!