CS6 - Blending Option Panel - check box text missing (see attached image)

I have this same issue. Were you able to figure it out?

I reset all preferences (as indicated in other answers) to no avail. 😞

??

Try resetting Photoshop preferences - when starting Photoshop hold Ctrl+Alt+Shift and you'll be prompted to reset preferences.

What have you done for trouble-shooting so far?

Restoring Preferences after making sure all customized presets like Actions, Patterns, Brushes etc. have been saved might be a good starting point:

https://helpx.adobe.com/photoshop/kb/basic-trouble-shooting-steps.html

This is the Audition forum - we don't know anything about blending option panels! If you can tell me which software you're using (Photoshop or Illustrator, I'd guess), I'll move this post to the appropriate forum.