Mate panel: false error report

[Beartooth]

I got an F31 message saying Mate-panel had crashed -- and it 
hadn't. This is on a machine which displays both on its own monitor and 
on my main one. (Both are behind an HDMI KVM-switch. Each has panels on 
all four sides, not identical.) The box that popped up the erroneous 
notice asked for a report, which I started, and then wanted to upload a 
whole core load, at many MiB and slowly. Stopping the upload killed the 
popped up box.

If the Mate crew really does want all that dump, please tell me 
how and where to send it, or what to do instead, and I will.