Good advice RorrKonn, been doing that (moving on) lol. I'm not too concerned about the names of the tools as long as it works. Unless Manga Studio 5 has an automated update that I don't know about, I didn't manually update the program, so unless it updated itself that probably wasn't the cause.

Someone on the Manga forum said to try going into the preferences and adding a shortcut next to Selection Launcher. I did that and it does seem to work now, although all the tools are still named "Marquee", but the strange thing is the shortcut key that I created doesn't turn the toolbar on or off, but now when I go into the View menu and uncheck or check Selection Launcher, it does turn the toolbar on or off. At least it works now, even though the shortcut itself doesn't work, just adding it fixed the operation in the View menu. Maybe a glitch in the program, or maybe something I did by mistake.