I just reproduced it on rev 68703, Solaris 10 on x86 (32-bit).  You might have
to add and remove Feature address as well as feature label. I have also 
encountered this crash numerous times when moving toolbars around.  I hope you
can find a way to reproduce it, because it is definitely still present.

Actually, I think I just now discovered the critical factor in reproducing this
bug.  As soon as you click the OK button to finish customizing the toolbar and
accept the new toolbar layout, immediately move the mouse up to the Address
toolbar row.  You might need to move the mouse within that row as well.
When I do this, it increases my odds of encountering the problem.

I have also noticed that sometimes after I customize the Project toolbar, clicking
on the Toolbar Options button displays the little popup window with the
non-visible choices over by the left side of the main window, very far from
where the Toolbar Options button is.  I don't know whether this is related to
the problem.