Text Expansion Works in Some Apps but Not Others?

My text expansion snippets suddenly stopped working in some apps but not others. When I invoke an abbreviation in Word or Excel, it works. When I try using the same abbreviation in Mail or Drafts, it doesn’t. It doesn’t matter if I use Rocket Typist, Text Expander 5, or Alfred. It doesn’t matter if the abbreviation starts with a “;” or an “x” — I type it, the abbreviation itself flashes on to the screen, and then … nothing.

Any ideas?

Ha. Solved. Keyboard shortcut conflict. Why that didn’t matter in Word and Excel says something about how not Mac-assed those two “native” apps are.