Hi! I see you're having trouble with your MobilityWare Solitaire app on your Mac. Can you tell me more about what exactly is happening? For example, does the app fail to open at all, crash during play, freeze, or show any error messages? Also, have you tried any steps so far like restarting the app or your Mac?

Once I understand what’s going on, I can guide you through some easy fixes to get it working again.

;the app will not open the screen is black

Thanks for sharing that the app opens to a black screen. Let's try a few things to get MobilityWare Solitaire running again on your Mac with OS X 10.15.7.

### Step 1: Force Quit and Restart the App
- Click the Apple menu at the top left of your screen.
- Choose "Force Quit."
- Select Solitaire if it's listed and hit "Force Quit."
- Then try to open the app again.

### Step 2: Restart Your Mac
Sometimes a simple reboot helps clear temporary glitches.

### Step 3: Check for App Updates
- Open the App Store on your Mac.
- Click on "Updates" in the sidebar.
- If there is an update available for Solitaire, install it.

### Step 4: Reinstall the Solitaire App
- Go to your Applications folder.
- Drag the Solitaire app to the Trash.
- Empty the Trash.
- Download and install the latest version of MobilityWare Solitaire freshly from the official Mac App Store.

### Step 5: Check Graphics Drivers and System Updates
While Macs manage graphics driver updates through system updates, it’s a good idea to ensure your OS is current:
- Apple menu > System Preferences > Software Update.
- Install any available updates for macOS Catalina (10.15.7).

If the issue persists after these steps, the black screen could be tied to a compatibility or display glitch in the app itself. You might also want to check MobilityWare’s support or community forums for any reported issues with the current version on macOS Catalina.

Would you like me to guide you through these steps, or have you already tried any of them?