I've noticed that when a iPrint client update is performed by Zen iPrint
policies, it doesn't restart the iPrint task-bar icon. If I logout/login
again or restart it is back. Not a big deal, but perhaps it is something
that can be addressed in a future update?

Zen 7 - iPrint policies.
Client has 4.16 iPrint client. Zen 7 iPrint client points to a 4.20 client.

For the first user to login on a given station, the iPrint client updates.
During the update, the iPrint task-bar icon disappears, but it not
re-launched on the completion of the update. All other functions continue
such as auto-printer distribution.

After a logout/login or reboot, the icon is back.