Troubleshooting Apple TV on Mac mini M4 Pro — macOS 27.0
I can understand your frustration, especially after restarting your Mac, shutting it down completely, signing out of iCloud and back in, and repeatedly closing and reopening the TV app.
The fact that the show artwork sometimes loads successfully, but the problem returns after quitting the app, restarting, or waking from sleep, is an important clue. It suggests that your Mac can retrieve the artwork, but something is preventing it from loading consistently.
I'd recommend working through the following checks in sequence, starting with the simplest and least disruptive.
First, check Apple's System Status page for reported issues with Apple TV or Apple Account services. Apple also provides guidance in If you can't connect to the App Store, iTunes Store, or other Apple services. If possible, open the TV app on another Apple device and check whether the same shows display correctly. If they do, the problem is more likely to be specific to your Mac.
Next, check whether the problem affects playback as well as artwork. While the TV Shows section is stuck on Loading, try playing an episode or movie and see whether other sections, such as Home or Movies, load normally. If playback works but the artwork doesn't, the problem may be related to artwork retrieval, metadata, or the TV app's local data rather than a complete loss of connectivity. Apple's guide, If you can't watch or stream movies, TV shows, or sports in the Apple TV app, provides additional troubleshooting advice for playback problems.
The next step is to test a different internet connection. Temporarily connect your Mac mini to a phone's Wi-Fi hotspot and check TV Shows again. If the artwork loads reliably on the hotspot, investigate your usual network's router, DNS settings, VPN, or filtering software. If the problem persists on both networks, focus on the Mac itself. Apple's connection troubleshooting guide also recommends testing another network when Apple services won't load.
You can then check whether the TV app offers a cache-reset option. Open the TV app and select TV >> Settings >> Advanced. Look for Reset TV Store cache, if available in your version. According to Apple's guide to Advanced settings in the Apple TV app on Mac, this option resets the temporary cache used for Apple TV Store pages and may help when a page isn't opening properly. After resetting it, quit the app with Command-Q, reopen it, and test again. Avoid broader reset options or manually deleting app data at this stage.
Since you're running macOS 27.0, also open System Settings >> General >> Software Update and check whether a newer compatible release is available. Review the release notes before updating. Apple's instructions are available in Update macOS on Mac. A software update may help if the problem is caused by an operating-system or app defect, although we shouldn't assume that your particular symptom is a confirmed bug.
If the problem continues, testing with a temporary macOS user account is a useful next step. Go to System Settings >> Users & Groups, create a temporary standard user if permitted, and open the TV app in that account. Sign in if necessary and check whether the artwork loads. If it works in the new account, a user-specific cache or setting may be involved. If it fails there too, a system-wide issue or macOS bug becomes more likely.
If none of these steps resolves the problem, record your exact macOS version and build number, whether playback works, and whether the fault returns after quitting the app or waking from sleep. Contact Apple Support Canada and provide those details so they can help investigate further.
I would avoid reinstalling macOS, deleting the TV app's container, or rebuilding your library until these less disruptive tests have been completed. The aim is to identify the cause before making changes that could affect your existing data or configuration.
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