Issue Description
Text appears distorted, apps crash when opening fonts, or Font Book reports errors.
Common Causes
- Corrupt font files
- Duplicate fonts
- Third-party font managers
Step-by-Step Solution
Step 1: Validate Fonts
- Open Font Book
- Select All Fonts
- Click File → Validate Fonts
- Remove fonts marked with serious errors
Step 2: Remove Duplicate Fonts
- In Font Book, click Duplicates
- Resolve duplicates automatically
Step 3: Reset Font Cache
- Restart Mac in Safe Mode
- Safe Mode clears font caches automatically
Step 4: Restart Normally and Test
- Launch affected apps and verify text rendering
Explore Further
- Remove unused third-party fonts
Prevention & Best Practices
Install fonts only from trusted sources.