#62 Crashes gnome-panel in GNOME Flashback

[Michael Crider]

In GNOME Flashback (Metacity) 3.28 (Ubuntu 18.04), with gnubiff 2.2.17, the gnome-panel crashes as soon as gnubiff finds mail. Steps to reproduce:
Right click panel -> Add to panel -> add gnubiff
Preferences -> configure one email account (no other setting changes needed)
When gnubiff checks and finds email, gnome-panel goes away. Sometimes sound will play before crash, not always. Icon and text does not change before crash. If running gnome-panel from terminal (run "gnome-panel --replace" before launching gnubiff), following error appears:
(gnome-panel:3430): Gdk-ERROR **: 11:00:49.008: The program 'gnome-panel' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadDrawable (invalid Pixmap or Window parameter)'.
(Details: serial 6341 error_code 9 request_code 130 (MIT-SHM) minor_code 5)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the GDK_SYNCHRONIZE environment
variable to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)
Trace/breakpoint trap