In what seems to be random occurrences, javascript files are not loading.

I believe this diagnosis is correct because a) I have code to check, b) I've stepped through the code, and c) I get “'myfunction' is undefined” error when functions in those files are used.

Sometimes this doesn’t happen for an hour, sometimes it happens every time I load the page, sometimes it happens every other time I load the page. It seems like every time I identify a consistent behavior so I can repeat it and diagnose it, it changes!

Does anybody have any idea what might be causing this?

I'm using :

• IE version 7.0.5730.11 (had &
  uninstalled IE8 Beta)


• VS2008

Right now, it appears to only be happening to my colleague and I on our development environments.

There is one script which appears to be missing more than any other. Here's the script tag.

<script language=javascript 

        type=text/javascript 

        src=js/Ajax.Utility.js?<%= ConfigurationManager.AppSettings[WebApp.JavaScript.FileVersion].ToString() %>></script>

Which evaluates to

<script language=javascript 

        type=text/javascript 

        src=js/Ajax.Utility.js?090324a></script>

The version query string parameter doesn't appear to have any effect either since I've both had and not had the problem immediately after changing it.