Looks like a bug in the pull-down menus. Try setting the following in your config. file:
ns_section ns/server/${server}/acs/pdm
# Flag to display the administration menu bar
ns_param MenuOnAdminPagesP 0
# Flag to display the default menu bar on non-/admin pages
ns_param MenuOnUserPagesP 0
This should make the problem go away. If so, please make an entry in the sdm about this problem.