🚀 go-pugleaf

I need some help on this one.  Im writing this (wonderful :-) utility
that I'm thinking of posting if I can make it bug free in the next two weeks.
I might be without net access for awhile after that. 
THE PROBLEM: My program seems to work fine from a shell (including 1.3's)
but crashes when run from CLI.  This fact, I hope, points to some problem
that someone might [must?] be aware of.  I'm using the manx compiler.
This program accesses files and writes to the current window(console).
It's using AmigaDos calls for all i/o.  Why would a shell be immune to these
crashes (i.e. system error-GURU-reboot) ?  I get guru # 4.00c04fd0 ( at addr
00c16??? also).  Gomf tells me its an illegal instruction & code likely out 
of control.  Too add to the confusion when I exited the shell and returned
to the CLI.  It worked!?  
I'm using two other boot-disks (1.2 & 1.3) to do the dry CLI tests. Could
these be bad (infected?-not according to VirusX1.2)?
                           
      / 
    \/  ross