As discussed on RexxLA:
Under certain circumstances rexx will crash when attempting to run code stored in a module. I have included a series of files to duplicate the process. During testing I created a file of similar size that consisted total of NOPs and that did not recreate the problem, I also tested with smaller programs and didn't have a problem.
test.rex -- loads comfree.rex and ivrpost.rex in to module and runs it.
ivrpost.rex -- code that is appended to comfree.rex
comfree.rex -- main body of code that runs