I have an app that I downloaded some time ago (DXO Optics) but for some reason I've never been able to keep it in the dock. It always appears as a question mark '?'. It launches ok when I click the question mark and it then turns into a proper icon. But it always goes back to a question mark when I quit the app. It also appears as a 'device' when launched. I tried to move it to 'applications' where I think it should be but it never goes in there. I cant locate it anywhere now not even in downloads which is where it used to be before my many attempts to move it to apps. Even spotlight cant find it, as it always brings up another DXO app instead. In fact if it weren't for the '?' icon in the dock I don't know how I'd launch it.