Hi there! I see you're running into a blue screen with the BNN Bloomberg app on your Mac running OS X 10.15.7 when trying to check your stock prices. Let’s get this sorted out for you.

First, just to clarify:
- Is this the BNN Bloomberg app you downloaded from the Mac App Store, or are you accessing it via a browser?
- Have you tried restarting the app or your Mac already?
- Have you updated the app to the latest version?

Assuming you’ve tried a restart and the app is the Mac version, here are some steps you can take to fix the blue screen issue:

1. Force Quit and Relaunch App
- Press Command + Option + Escape to open the Force Quit window.
- Select BNN Bloomberg and click “Force Quit.”
- Then relaunch the app to see if it loads properly.

2. Clear App Cache and Preferences
Sometimes corrupted cache or preference files cause loading problems. Here’s how:
- Open Finder, then press Command + Shift + G to open "Go to Folder."
- Type ~/Library/Containers and locate the folder related to BNN Bloomberg (it might be named something like ca.bellmedia.bnnbloomberg).
- Move that folder to the Trash (this removes cached data).
- Relaunch the app.

3. Check for App Updates
- Open the Mac App Store, go to Updates, and see if there’s a newer version of the BNN Bloomberg app.
- Update if available.

4. Reinstall the App
- Delete the app completely by dragging it to Trash.
- Restart your Mac.
- Download and install the app fresh from the official site or the Mac App Store.

5. Check Network Connection
- Ensure your internet connection is stable—sometimes the app gets stuck on a loading screen with poor connectivity.

6. Check for OS Updates
- While you’re on Catalina (10.15.7), check if any available system updates might improve app compatibility by going to System Preferences > Software Update.

If the issue persists after these steps, it could be a bug or server-side issue. Some users have reported similar problems and resolved them by either waiting for an update or contacting BNN Bloomberg support.

Would you like me to provide you with the contact info for BNN Bloomberg support, or should we try some advanced troubleshooting steps next? Let me know!