I would agree about the wrapper script having an error, except that the wrapper script is never being executed. Regardless of what is in the shebang line for the wrapper script, running "myperlscript", say, tries to execute myperlscript with ksh, and anything in the wrapper script isn't executed at all. (I'm not at work right now, so I can't post the scripts I'm using.)

Update: I tried it under Cygwin using bash and it worked fine at first; however, now when I run it I'm getting "bad interpreter: No such file or directory" some times and "bad interpreter: Interrupted system call" other times. Not sure what happened to make it stop working.