Chrome and Safari fail on second ScriptManager.RegisterClientScriptInclude in updatepanel

No one answered my initial question, so let me ask it differently.  Hopefully it will make more sense this time.

I have a ASP.Net/VB application, a master page, and updatepanel within a content page.  On a partial postback I need to include two .js based on the user input.  The first include works fine in all browsers.  The second include will kill Chrome and Safari.  The error that is thrown follows, after the error all JavaScript processing stops.

Here is the error from Chrome's JavaScript debugger:
uncaught exception Sys.ScriptLoadFailedException: Sys.ScriptLoadFailedException: The script 'http://www.***.js' failed to load. Check for:
 Inaccessible path.
 Script errors. (IE) Enable 'Display a notification about every script error' under advanced settings.
 Missing call to Sys.Application.notifyScriptLoaded().

I have added the following to the end of each .js file.
if (typeof(Sys) !== 'undefined') Sys.Application.notifyScriptLoaded();

Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender
 
        'FontFile?Name.Value contains the font name
        'FontFile?File.Value contains the .js file name containing font information created by Cufon
 
        ScriptManager.RegisterClientScriptInclude(UpdatePanel1, GetType(Page), FontFile1Name.Value, FontFile1File.Value)
        ScriptManager.RegisterClientScriptInclude(UpdatePanel1, GetType(Page), FontFile2Name.Value, FontFile2File.Value)
 
    End Sub

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vshockneyAsked:
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