Thanks for your comments.  I never did get to the bottom of it and the program's writer, Michael Devore, wasn't particularly helpful, either, commenting only that I should ask FProt about it.

In the finish I used the workaround of running FProt in SafeMode - it's not 100% effective this way but it found and eliminated the bugs I'd suspected were there.

Ian Porter
Computer Guys Inc.
Arrowtown
New Zealand
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The NOSPIN Group
http://freepctech.com

  ----- Original Message ----- 
  From: David Gillett 
  Subject: Re: [PCSOFT] What is a 'Causeway Dos Extender'?


    "Causeway DOS extender" is a programming tool that the folks at FProt use
  and include in the runtime files for their product, in order to be able to
  run such a large application from the DOS prompt.
    Apparently, it is not managing to initialize the environment it needs to
  provide for FProt to run.

    It *probably* wants to be able to find a few megs of Extended memory to
  manage, and it may be that something in the DOS config on this machine is
  preventing that, either managing Extended memory in an incompatible fashion,
  or perhaps configuring it all as Expanded memory instead (which many old
  large DOS applications needed).

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