Hi there! I understand that your Mpix app is crashing right after you open it on your iPhone running iOS 17.5.1. Let's try to get this sorted out together.

To start, a few simple steps usually help with app crashes:

1. Force close the app and reopen: Swipe up from the bottom of your screen and pause in the middle to bring up the app switcher. Swipe the Mpix app off the screen to close it, then open it again.

2. Restart your iPhone: Sometimes a reboot can clear temporary glitches.

3. Check for app updates: Open the App Store, tap your profile icon at the top right, then scroll to see if there’s an update available for Mpix. Updating often fixes bugs.

4. Reinstall the app: If that doesn’t help, delete the Mpix app by pressing and holding it on your home screen, then tap “Remove App” > “Delete App.” Then reinstall it from the App Store.

If it still crashes after these steps, the issue might be related to permissions—sometimes the app crashes if it lacks access to your photo library. You can check this in Settings > Privacy & Security > Photos, and make sure Mpix has permission set to “All Photos”.

Could you tell me if you get any error messages or if the crash happens immediately when opening the app? Also, have you already tried any of these steps? That way, I can guide you further.