Have you tried the useLegacyV2RuntimeActivationPolicy flag in your web.config/app.config http://msdn.microsoft.com/en-us/library/bbx34a2h%28VS.100%29.aspx -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/Maestro-3-5-API-Issues-tp7050967p7053147.html Sent from the MapGuide Users mailing list archive at Nabble.com.