We have an MXD published as an AGS 10 SP1 map service with several multi-layered maplex symbols in it. The symbols render fine in Silverlight and even in KML when published as an MSD. But symbols which have a white backlayer are missing the white layer when rendering via (MXD) KmlServer. If we change the color to slightly off-white, no problem. We also checked and made sure there weren't any masks defined in the symbols. The offwhite workaround is fine for us, just thought it should get reported.
On a side note, why can't we get KML balloon popups with the MSD-published services?
Thanks!