OK, I don't quite understand why this is, but after spending a bunch of hours on this I finally came across someone who had a similar issue (Post).
The fix is to ensure the ToolkitScriptManater has the CombineScripts attribute set to false. For example:
javaConvert
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Re: IE7 Only "system.extended.ui null or not object"
Dec 31, 2009 12:24 AM|LINK
OK, I don't quite understand why this is, but after spending a bunch of hours on this I finally came across someone who had a similar issue (Post). The fix is to ensure the ToolkitScriptManater has the CombineScripts attribute set to false. For example:
Hope this helps someone else
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