The application Gnucash cancelled shut down

[prl]

Gnucash 2.4.10 (using SQLite for the accounts file)
OS X 10.7.3

If I shut down my Mac when Gnucash is running, applications start 
exiting (as expected), and then I get the message: "The application 
Gnucash cancelled shut down", even though Gnucash itself exits.

I also had the same behaviour on OS X 10.6.8 and Gnucash versions 2.4.9 
and 2.4.10.

I've done some searching based on the message and the only think I've 
found that seems even remotely related is from the Gnc 2.4.6 release 
notes <http://www.gnucash.org/oldnews.phtml>: "Fix up the Mac shutdown 
process to give Gnucash a chance to clean up without spewing critical 
errors about the main loop already running (because of calling 
gnc_shutdown in an event handler)." However, I don't think that that 
refers to the same problem.

I've had a look at the trace file from an instance of this happening, 
and apart from lots of entries being tagged with 
"g_signal_handlers_disconnect_matched", which I assume is a response to 
Gnucash being sent a SIGTERM or similar, I can't see anything that 
appears to relate to Gnucash stopping the shutdown.

It's not a big deal, really, just curious that shutdown appears to make 
Gnucash exit cleanly, but Gnucash appears to be stopping the shutdown.

Peter