>>Sometime later it worked by itself.
>
>I prefer to develop the Javascript that is specific to a web page in the page itself. After I have everything working I will move it into an external .js file. It still sounds like a caching issue for your problem. How are you loading the external .js file from the master page?

The file is referenced in the head section of the Master page. When I was trying to debug pressing F5, it seems to not load my latest function. Once I did run the application without debugging, it did recognize the function. I do want this js to be cached in general, but not like this, of course, when I update it.