Hello! Sorry to hear the MyPetzl Light app is crashing on the loading screen on multiple devices. That sounds quite inconvenient. To help you better, could you please confirm a couple of things for me first?

1. Are all the devices running macOS 10.15.7, or do you have other platforms (like iOS or Android) in use?
2. Have you updated the MyPetzl Light app to the latest version available in the App Store?
3. Have you tried uninstalling and reinstalling the app on any of the devices?
4. Are the devices connected to the internet when you try to open the app?

Meanwhile, here are some basic steps you can try that often help with app crashing issues:

1. Restart your device to refresh the system.
2. Make sure your app is updated to the latest version.
3. Delete the app and reinstall it fresh.
4. Check if your device OS is supported by the current app version — some users have reported compatibility issues on older or newer OS versions.
5. Clear any app cache if possible (though on macOS, this might require manual removal of related files).

If you have already tried these or the problem persists, I can guide you on more advanced troubleshooting. Let me know what you’ve already done and what devices are in use, and we'll get this sorted out!

I am using the lastest version of IOS and ipadOS. According to the app store, it is compatible. I literally just downloaded the app, it must be on the latest version. I have restarted my devices, connected to wifi and reinstalled it. Nothing worked

Thank you for those details. Since you've confirmed the app is fully updated, you are on the latest iOS and iPadOS versions, have reinstalled the app, restarted your devices, and maintained a good Wi-Fi connection, the usual fixes don’t seem to help here.

Interestingly, some recent user reports suggest that despite the app store stating compatibility, the MyPetzl Light app has had issues working properly on the latest iOS versions, including crashing or failing to load beyond the splash screen1. It seems this might be a problem on the developer’s side related to full support for the newest operating system updates.

What I recommend next is:

1. Check for any pending app updates frequently: The developers may be releasing a patch to fix this problem soon.
2. Contact Petzl support directly: They might have workarounds or beta versions available to help in the meantime.
3. Try using a different device temporarily: If possible, test on a device with an older iOS version (if you have access) since the app reportedly works better there.
4. Keep an eye on official announcements: Petzl’s support and community forums might post updates on this issue.

If you want, I can help draft a message to Petzl support with the details you provided so they fully understand your situation.

Does that sound good? Let me know if you'd like to proceed or explore any other steps!