Anyway, what does it mean? Basically, that you can't manually edit the menus easily. Bit of a pity, but I can live with it. However... where's Citrix gone? It's not in the menus. To fix, add this:
title="Citrix ICA Manager" command="/usr/lib/ICAClient/wfcmgr" sort="$" \
in a file called /usr/share/menu/wfcmgr and then run (as root) update-menus and hey presto, Citrix ICA manager appears in the Applications/Network menu. Magic!