Hi there! I understand that the BorrowBox Library app is closing immediately when you try to open it on your Mac. That can definitely be frustrating! Let's work through this together.

First, can you let me know if you've recently updated your operating system or the BorrowBox app? Sometimes updates can cause compatibility issues.

While you gather that info, here are some steps we can try:

1. Restart Your Mac: Sometimes, simply restarting your system can clear up temporary glitches.

2. Update the App: Make sure you have the latest version of the BorrowBox app. You can check for updates in the App Store.

3. Reinstall the App:
- Open your Applications folder, find the BorrowBox app, and drag it to the Trash.
- Then, go to the App Store and reinstall it. This can often resolve crashing issues by removing old corrupted files.

4. Check for Conflicting Apps: Sometimes other apps can interfere with BorrowBox. Ensure that any other media apps (like music players or video apps) are closed when you try to open BorrowBox.

Let me know how it goes or if you encounter any specific error messages! If these steps don't solve the problem, we might need to dig deeper or consider contacting support at [email protected].