[ic] 4.9.3 "ship status update failed"

[interchange-users@icdevgroup.org (Grant)]

I just upgraded my 4.8.6 store to 4.9.3 and now when I try to update the
status of an order via "Ship all lines -> Update the order" I get the
following message in green on the Pending Orders page:

Orderline 2525-1 ship status update failed.

The status is changed to "shipped" just fine, but no ship_notice email is
sent.  What could be going wrong?  There doesn't seem to be any enlightening
info in the error.log at all.

- Grant