Could the culprit be the change of the ARCH tag?
yum list switchdesk:
Looking in Available Packages:
Name Arch Version Repo
--------------------------------------------------------------------------------
switchdesk noarch 4.0.2-1
development
Looking in Installed Packages:
Name Arch Version Repo
--------------------------------------------------------------------------------
switchdesk i386 3.9.8-18 db
yes, that is exactly what it is.
set exactarch=0 in yum.conf and this update will go through.
Stanislav, thank you - good eye.
-sv