>>>>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.
>
>Ah, so this occurs within the IDE debugging. I assume the master page itself would have to change for the refresh to occur. Probably best to write the code in the aspx page then move to .js when finished. You could try forcing the master page to refresh by saving it just to see if it clears the cache.

Good idea, let me try to re-save Master page, because otherwise I'm getting the same problem again - my latest Master.js is not recognized.