Hi there! I understand you're having trouble with the Cub Grocery & Liquor app crashing immediately after the latest update on your iPhone with iOS 16.3.1. Let's sort this out together.

First, can you tell me if you’ve already tried any steps, like restarting your phone or reinstalling the app? That way, I won’t suggest anything you’ve already done.

Meanwhile, here are some useful steps to try if you haven't done them yet:

1. Force Close the App and Restart Your iPhone
- Swipe up from the bottom of the screen and hold to open the app switcher.
- Find the Cub Grocery & Liquor app and swipe it away to close it completely.
- Restart your iPhone by holding the side button and either volume button until the slider appears, then slide to power off. Turn it back on after a minute.

2. Reinstall the App
- Tap and hold the app icon until a menu appears, then select "Delete App.”
- Go to the App Store, search for "Cub Grocery & Liquor," and reinstall it fresh. This can clear corrupted data causing crashes.

3. Check for iOS Update
- Sometimes, an app update expects the latest iOS features. Go to Settings > General > Software Update to see if iOS 16.3.1 has any minor updates or patches.

4. Check for App Updates
- Open the App Store, tap your profile icon at the top right, and scroll to see if there’s any newer update for Cub Grocery & Liquor.

If the app still crashes after these steps, it could be a known issue with the latest app update itself. Some users have reported similar problems with the new interface changes recently1. If that's the case, I can help you report it to the app’s developers for a fix or suggest alternatives meanwhile.

Could you please let me know which of these steps you've tried or if anything else is happening on your device when you open the app? That will help me guide you better!