Update:

I now have a workaround configuration that at least allows
me to park without anything too terrible happening.  The
sim will run for an hour, even with the FPE trap enabled.

This workaround configuration (call it "X") entails:
1) Passing *no* options on the command line, using
 options in the .fgfsrc file instead.
2) Disabling various "AI" things:
  --prop:/sim/ai-traffic/enabled=0
  --prop:/sim/traffic-manager/enabled=0
  --disable-ai-models

In contrast:

1) Starting from X, if I pass my usual bunch of arguments 
on the command line, I get an FPE very early, while the 
splash screen is still up.  This happens *even if* the 
exact same options are also passed in my .fgfsrc file.

2) Starting from X, if I don't disable the AI stuff, then
after a few minutes I get a finite bunch of nans on the 
console ... without catching any FPEs.

3) Keeping X with no changes, I sometimes observe segmentation
faults when I exit out of the sim.  A traceback can be 
found at:
  http://www.av8n.com/fly/fgfs/segv--21023.log

=====================

My next step is to start incorporating Jester's various
nan-fixes into my workspace.

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