Hi there! I understand you’re seeing a blank (plank) screen when trying to use the Speak & Translate app on your Mac running OS X 10.15.7. Let’s get this sorted out.

To start, could you tell me a bit more?
- Does the app show the blank screen immediately when you open it, or after attempting a specific action (like starting a translation)?
- Have you tried restarting the app or your Mac since the issue began?
- Is your app updated to the latest version available for your Mac?

Meanwhile, here’s a step-by-step approach to try for this blank screen problem:

1. Force Quit and Relaunch the App
- Click the Apple menu (top left corner) > Force Quit.
- Select Speak & Translate from the list and click Force Quit.
- Then reopen the app and see if the screen loads correctly.

2. Restart Your Mac
- Sometimes a fresh start can clear caches causing display issues.

3. Check for App Updates
- Open the App Store, go to Updates, and make sure the app is the latest version. Bug fixes related to blank screens may be included in recent updates.

4. Clear Cache or Reset App Preferences
- Locate app settings or preferences file for Speak & Translate (usually in ~/Library/Preferences). Deleting or resetting this might clear corrupt settings causing the blank screen. If you’re not comfortable with this step, I can guide you through it.

5. Check for macOS Updates
- Though you’re on 10.15.7 (Catalina), check if any minor updates are available in System Preferences > Software Update.

6. Reinstall the App
- If nothing changes, delete the app and reinstall it fresh from the App Store.

If you’ve already done some of these, let me know which ones so I can suggest deeper troubleshooting. Also, if you use any network features within the app, please check your internet connection as well.

Would you like me to walk you through any of these steps more specifically?