[GNC] Occasional crashes in GnuCash 3.3 MacOS 10.11.6

[prl]

I've been having occasional crashes in GnuCash 3.3 on MacOS 10.11.6 (the 
Mac is a MacBook Pro 13-inch, Mid 2009 and can't be upgraded to a more 
recent MacOS version).

The crashes typically happen within the first few transactions that I 
enter after starting GnuCash.

I've pressed "Report..."  the "GnuCash quit unexpectedly" a couple of 
times - but that says it reports to Apple. Is that a useful way of 
getting the bug info to the GnuCash devs?

Pressing "Reopen" in the popup doesn't seem to do anything. GnuCash 
isn't re-opened. Restarting it normally from Finder starts it with the 
expected GnuCask popup about the presence of the lock file.

I have the stack trace info for the most recent crash, but the 
gnucash.trace file appears to have been overwritten when I restarted 
GnuCash to do what I was actually trying to do at the time.

This is a snippet from the stack trace:

Exception Type:        EXC_CRASH (SIGABRT)
Exception Codes:       0x0000000000000000, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Application Specific Information:
*** Terminating app due to uncaught exception 
'NSInvalidArgumentException', reason: 
'-[_CFXNotificationObjectRegistration visibleFrame]: unrecognized 
selector sent to instance 0x7f838051eac0'
terminating with uncaught exception of type NSException
abort() called

Application Specific Backtrace 1:
0   CoreFoundation                      0x00007fff980b0452 
__exceptionPreprocess + 178
1   libobjc.A.dylib                     0x00007fff8c23d73c 
objc_exception_throw + 48
2   CoreFoundation                      0x00007fff9811a18d 
-[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3   CoreFoundation                      0x00007fff980204c1 
___forwarding___ + 1009
4   CoreFoundation                      0x00007fff980c4a48 
__forwarding_prep_1___ + 120
5   libgdk-3.0.dylib                    0x000000010fb60d02 
gdk_quartz_monitor_get_workarea + 98
6   libgtk-3.0.dylib                    0x000000010f74744f 
gtk_window_guess_default_size + 79
7   libgtk-3.0.dylib                    0x000000010f74116b 
gtk_window_compute_configure_request + 299
8   libgtk-3.0.dylib                    0x000000010f74a921 
gtk_window_realize + 641
9   libgobject-2.0.0.dylib              0x000000010ff1da0a 
_g_closure_invoke_va + 314
10  libgobject-2.0.0.dylib              0x000000010ff35831 
g_signal_emit_valist + 1521
11  libgobject-2.0.0.dylib              0x000000010ff36216 g_signal_emit 
+ 134
12  libgtk-3.0.dylib                    0x000000010f727c81 
gtk_widget_realize + 257
13  libgtk-3.0.dylib                    0x000000010f6e4b54 
gtk_tooltip_show_tooltip + 436
14  libgtk-3.0.dylib                    0x000000010f6e517c 
tooltip_popup_timeout + 44
15  libgdk-3.0.dylib                    0x000000010fb27992 
gdk_threads_dispatch + 50
...

Does this look like a known bug? I searched GnuCash Bugzilla for 
"_CFXNotificationObjectRegistration visibleFrame" and "" it didn't find 
anything useful.

It doesn't appear to be the same bug as 
https://bugs.gnucash.org/show_bug.cgi?id=796656

I haven't been able to work out a reliable set of actions to trigger the 
bug.

I'm happy to make a Bugzilla report - is there anything useful I can put 
in the report apart from the stack trace and gnucash.trace files?

Peter