Windows 7 Enterprise (64bit)
Umbraco 4.5.2
SQL 2008 R2 Express
Windows 2003
.NET Framework 4.0
Chrome 8.0.552.224/IE 8.0.7600.16385-

I have created a macro container datatype and added it to my document type, now when I add a root node for my frontpage and navigate to the tab where I have added the macro container, but when I click Insert macro it returns this error:

/ScriptResource.axd?d=u5AQYh6vsxCTi6INpQnC-Ay0BTDoTIKrmS2CvHRo6V_mtbcbIdiw5w9E9RaXduSidbH1p8uDEMJvkid84EOolrPeyeGASjiytj7I6ZUTM8tee4b9E7BCMjhy0q9j6wQP4EuGVhClRd9Km-n17eJAxli4gMS48Y8GIFQcaPFH_YsebOlBSqu_4Hb_Oex3yxVF0&t=2610f696:5
Uncaught Sys.WebForms.PageRequestManagerServerErrorException: Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500

This happens only on the root node not on sub nodes. I wanted to use this for a side widget bar however it won't work.

Any ideas