I have the RadScriptManager and the RadComboBox working correctly on my site for most users, but several have reported encountering JavaScript errors that I cannot reproduce/ troubleshoot.

The details of the error they are encountering are below.  Anyone have any ideas on how to resovle/troubleshoot this?

The error seems to imply a request that does not return JavaScript, but that doesn’t make sense since the error is occurring with http://aspnet-scripts.telerikstatic.com/ajaxz/2010.2.929/Common/Core.js

Error Details:
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET CLR 1.1.4322; Tablet PC 2.0; .NET4.0C; InfoPath.3; MS-RTC LM 8; Zune 4.7)

Timestamp: Tue, 8 Feb 2011 00:00:24 UTC

Message: Invalid character

Line: 1

Char: 1

Code: 0

URI: http://aspnet-scripts.telerikstatic.com/ajaxz/2010.2.929/Common/Core.js

Message: Invalid character

Line: 1

Char: 1

Code: 0

URI: http://aspnet-scripts.telerikstatic.com/ajaxz/2010.2.929/Common/jQuery.js

Message: Invalid character

Line: 1

Char: 1

Code: 0

URI: http://aspnet-scripts.telerikstatic.com/ajaxz/2010.2.929/Common/jQueryPlugins.js

Message: Invalid character

Line: 1

Char: 1

Code: 0

URI: http://aspnet-scripts.telerikstatic.com/ajaxz/2010.2.929/Common/Navigation/NavigationScripts.js

Message: Invalid character

Line: 1

Char: 1

Code: 0

URI: http://aspnet-scripts.telerikstatic.com/ajaxz/2010.2.929/ComboBox/RadComboBoxScripts.js

Message: 'Telerik' is undefined

Line: 306

Char: 5

Code: 0

URI: http://mySiteUrl

var a=this._owner.get_masterTableView().get_columns(); 
for(var d in a){if(!a[d].get_visible()){this._owner.get_masterTableView().showColumn(d); //error is here

protected void rgAddress_UpdateCommand(object sender, GridCommandEventArgs e)

GridEditableItem editedItem = e.Item as GridEditableItem;

int row = editedItem.RowIndex - 3; //removed header rows.. this is ugly

dtaddress.Rows[row]["address1"] = (editedItem["Address1"].Controls[0] as TextBox).Text;

dtaddress.Rows[row]["address2"] = (editedItem["Address2"].Controls[0] as TextBox).Text;

dtaddress.Rows[row]["city"] = (editedItem["City"].Controls[0] as TextBox).Text;

 dtaddress.Rows[row]["state"] = (editedItem["State"].Controls[0] as TextBox).Text;

 dtaddress.Rows[row]["country"] = (editedItem["Country"].Controls[0] as TextBox).Text;

 dtaddress.Rows[row]["ZipCode"] = (editedItem["ZipCode"].Controls[0] as TextBox).Text;*/