As you can see in my signature the text is completely invisible. The signature formats as if there was text on it but the text is not visible. I double-checked tha the text is not the same color as the background, it should be the same color as the outline. Also tried changing the text and the background to completely different colors but the text is still invisible.

EDIT: Figured out that font "F500" is broken by changing to a different font. So we could consider that this bug report is about that font

EDIT2: Not only F500 is broken, here's the complete list of fonts that don't work:

• StayPuft
  
• F500
  
• GenAI
  
• GenAR
  
• Bookwork
  
• Flintstones
  
• Scratch
  
• Screwball
  
• Typewritter
  
• Hammerhead
  

All those fonts seem to make the text invisible.