Mac – Shortcut to create checklist on Notes (Mac)

If you previously had Twonky Media Server installed and removed it, that could be the culprit. I had the same issue, though with Lotus Notes (also conveniently called Notes.app), starting/popping up every 5 seconds.

CleanTwonkyServerData.command (in /Users/Shared) was the culprit, it might be the same for you.

This isn't exactly what you were asking for, but perhaps it is close enough.

Just below the menu place where you bring up the color picker (Format->Font->Show Colors) are two other menu items: Copy Style and Paste Style. This is what worked for me:

1. Select some text in your note
2. Manually set the color, like you do now (via Show Colors)
3. Set the cursor anywhere inside the colored text (don't select any text, just put the cursor there)
4. Choose Format->Font->Copy Style
5. From now on (including across relaunches of the Notes app) you can select the text you want to color and simply use the keyboard shortcut for Paste Style!

Hope this works well enough for you.