Well, it's not a problem in the default UI. It's only a problem when you move some addon frames to the same place on the screen where the button is, without moving the button. The same thing would happen if you moved something over the top of your minimap, but didn't move the minimap -- you wouldn't be able to see the minimap. Also, if you search this site for "power bar" that addon is the #2 result, so it's not really hard to find if you need it.
If you're using a premade compilation, though, its uploader should really ensure that the extra action button is usable without you needing to go download a separate addon to move it. Have you told the compilation's uploader about the problem?