Hi there! I see your Map My Walk app is not responding on your Mac running OS X 10.15.7. Let's work through this together to get it back up and running smoothly.

First, could you tell me a bit more about what happens when the app stops responding? For example, does it freeze on startup, crash after some use, or just not load at all? Also, have you noticed if this started after any recent updates or changes to your device?

In the meantime, here are some initial steps tailored for your Mac that often help resolve app responsiveness issues:

1. Force Quit the App and Restart
- Click the Apple menu () at the top left of your screen.
- Select "Force Quit…" from the dropdown.
- In the list, select Map My Walk if it's showing as “Not Responding” and click "Force Quit."
- Once quit, try reopening the app from your Applications folder.

2. Restart Your Mac
- Sometimes a simple restart clears temporary glitches.
- Click Apple menu > Restart.

3. Check for App Updates
- Open the App Store on your Mac.
- Click "Updates" in the sidebar and see if Map My Walk needs updating.
- Keeping apps up to date can fix bugs that cause unresponsiveness.

4. Check Internet Connection
- The app may rely on internet connectivity to load data.
- Ensure your Mac is connected via Wi-Fi or Ethernet and try toggling off and on.

5. Clear Cache or Temporary Data (If Applicable)
- While Mac apps don’t always have built-in cache clearing, sometimes deleting preference files helps.
- If you’re comfortable, you can navigate to ~/Library/Containers/ and look for a folder related to Map My Walk, then move it to trash. Let me know if you want detailed steps here.

Please try these and let me know how it goes or if you run into any issues during the steps. If the app still doesn’t respond, we can dig deeper into settings or consider reinstalling it as a next step.

Are you able to provide any more details about the behavior as well? That will help me assist you better.