Current build of 1268 appears to have resolved the issue, however this has not been released to the public.ArcGIS Explorer 1200 ArcGIS Server 10 compatibility patch<a href="http://resources.arcgis.com/content/patches-and-service-packs?fa=viewPatch&PID=116&MetaID=1624" target="_blank">http://resources.arcgis.com/content/patches-and-service-packs?fa=viewPatch&PID=116&MetaID=1624</a>