All of our shared hosting servers are now running the latest build of the Microsoft ASP.NET Ajax extensions (RC).  We had 1 or 2 servers that were running previous CTP's, so if you were on one of these servers, you may need to update your Ajax-enabled applications to the Release Candidate.  See the migration guide at http://ajax.asp.net/files/Migration_Guide_CTP_to_RC.aspx for more details on what you need to do. 

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James Sawyer
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Dev Lead
Ultima Support Team