"find selected tags with" crashes x

[nyall <nyall zombiepigs net>]

I've recently run into a strange problem with f-spot on my PC. I'm
running Ubuntu Gutsy and I encounter the problem both with the included
version of f-spot (0.4.0) and also when I compile the latest SVN.

Basically, if I have a tag selected, and run my mouse over the
Find->Find Selected Tags With menu, x hard locks on me. I can only
recover my computer by ctrl-alt-f1 and killing the f-spot process. 

If I run f-spot from a terminal, I get the error message 
"(f-spot:6533): Gtk-CRITICAL **: gtk_widget_event: assertion
`WIDGET_REALIZED_FOR_EVENT (widget, event)' failed"
repeated over and over when the lock occurs.

I'm not sure what could be causing this - i've tried deleting the
~/.gnome2/f-spot folder and reimporting all my pics, but the same thing
happens.

If anyone could help me track this down it'd be really appreciated - I
love f-spot and it's killing me that I can't use it at the moment!!

Regards,
Nyall