I am using a Canon 640 printer and my MPNavigator will not remain open.  It pops open then quickly closes.  I've used it for several years but it just started doing this.  What can I do to fix this problem?

I am using a Canon 640 printer and my MPNavigator will not remain open.  It pops open then quickly closes.  I've used it for several years but it just started doing this.  What can I do to fix this problem?

I had a similar problem with a Canon MP800R under Mac OS X 10.9.2 Mavericks.
In my case, the MP Navigator app in the dock was linking to the wrong file.
It linked to Applications > MP Navigator 2.1.app > Contents > Resources > MP Navigator.app, but it should link to the "main" app, probably under Applications > MP Navigator 2.1.app.
After pulling the correct MP Navigator app file to the dock, I can start MP Navigator again by clicking on it in the dock. However, when clicking on it, a second MP Navigator icon will show up in the dock and stay there until the app is closed. By the way, the MP800R scanner also works (although officially not supported by Canon).

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