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mate-panel segfault

I've been having a minor but mildly annoying problem.  From time to time,
the entire MATE desktop will flash, and all open windows remain open;
however, the order in which their tabs appear in the bottom panel is
randomly rearranged.  So, if I have 13 terminal windows open, I can no
longer quickly bring the one I want to the front until I've arranged
them back in the order in which I had them.  I think this only affects
the Workspace I have open (but can't be completely certain).  It happens
fairly infrequently.

When this happens, I've discovered /var/log/syslog contains a message
like this:

                debian kernel: [605512.613750] mate-panel[3844]: segfault at 1 ip 00007f5c90049823 sp 00007ffc68f6b6f0 error 4 in libgtk-3.so.0.2200.11[7f5c8fca1000+700000]

(The instruction pointer and the stack pointer values will vary,
as you'd expect.)  I am running Debian 9, Linux kernel 4.6.0-1-amd64
x86_64, with MATE 1.16.2 desktop; my computer has a PNY Quadro K620
2GB Video Card and is running libdrm-nouveau2 version 2.4.74-1 and
xserver-xorg-video-nouveau version 1:1.0.13-3.

Can anyone suggest what causes this issue and how to prevent it?

Best regards,
Greg Marks

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