Many thanks, Nibelheim!! Both texts are working correctly (as far as I can tell). I'll know more tomorrow when I wake up and can try it on some other power types on different characters. One thing, though: There is no "UNIT_DISPLAYPOWER" in my Events drop down menu. Not that it matters, since it is apparently working.
Here's my PB4 frames (with your text coloring) for my Warlock:
As you can see, my goal was to make everything gray-scale, except for the health, power and level texts. The "green steps" on the left of the name are from an addon I'm sure you are familiar with: nibPointDisplay. They represent my shards, and I have them set to display as: 1 - red, 2 - 1red 1yellow, 3 - all green.
Again, many thanks. I do appreciate your help, and the fact that you can't even log on to check out your code speaks volumes about your Lua skills.