Hi there! I understand that you're seeing a dark screen instead of most images on Flickr, and you’ve already tried different browsers on your Mac running OS X 10.15.7. That’s a helpful detail. Just to clarify, are you experiencing this issue only in browsers, or do you also use the Flickr app on your Mac or any other device?

Since you mentioned trying different browsers, I’d like to guide you through a few targeted steps on your Mac to potentially resolve this:

1. Clear Browser Cache and Cookies: Sometimes old cache or cookies cause images not to load properly. For Safari on your OS version:
- Open Safari.
- Click "Safari" in the top menu, then "Preferences."
- Go to the "Privacy" tab and click "Manage Website Data."
- Find flickr.com and remove its data, or simply clear all website data.

2. Disable Browser Extensions: Certain browser extensions can interfere with page loading.
- Go to Safari > Preferences > Extensions.
- Temporarily disable all extensions and reload Flickr to test.

3. Check Network Connection: Ensure your internet connection is stable. Try toggling your Wi-Fi off and back on.

4. Test in Private/Incognito Mode: Open a private window in Safari (File > New Private Window) and visit Flickr to see if images load.

If you also use the Flickr app on your Mac or mobile device, the following may help:

- Force Close and Relaunch the App: Quit the app completely and restart it.
- Clear App Cache or Data: If the app allows clearing cache, try that.
- Log out and Log back in: This often refreshes the app connection.
- Update the App: Make sure your Flickr app is updated to the latest version.
- Reinstall the App: Uninstall and reinstall in case of corrupted files.

Let me know if you have tried any of these already or if the issue persists after these steps, and we can explore further options. Also, if you can specify whether this occurs only in browsers or the app as well, that will help tailor the solutions better.

Are you willing to try these steps now?