Preliminary Solution:
I will send more info in more detail when I've got a test case, also I need to test against 5.3.1 (works on 5.3) but:
1) The cause of the flomap exception was a user-code dependency on the racket library stepper.rkt in a #lang web server module, complied under raco exe
2) The dependency arose through a (require macro-debugger/stepper) in multiple #lang racket sub-modules, again within user-code
3) this particular dependency was completely unneccessary for production code, and was eliminated by the user.
I believe my problem is of limited general interest and does not demonstrate any significant flaws in Racket 5.3.1.
I'll send along test case, in the interim, thanks for all the assistance.
The discussion was invaluable. R./ Zack
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