Yeah, it's most likely something with the Sierra beta OS versions I'm running. 1P is installed in the Applications folder, and has worked flawlessly for years... up until a few beta versions ago, when it simply stopped showing up in Spotlight. It still functions perfectly fine, but in order for me to launch the app, I actually have to put it in the Dock, or go up under the menubar icon as opposed to just tapping Command+Space and typing 1p as I previously did.
I have the same issue on both MBP and iMac (both running the same versions of 1P and macOS Sierra betas.
I had to experiment. I began removing icons from the menu bar, rebooting and watching for the 1P disappearance. It took removing a few for the menu bar to retain 1P. But there is no explanation of why ONLY 1P is so sensitive in the menbar. None of the other icons have menu bar issues.