Whenever a person registers for the forum (this has happened for more than a year now), they get this message:

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Can't open 'MembersPath/pm_topics/K/00010752.cgi'.

Permission was denied - please ask the administrator to check the permissions on that file/directory.

The exact error returned by the operating system is:
Permission denied
» Please use your browser's back button to return.
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However, their registration is written to the members queue and everything is fine. They end up thinking it did not work and register again.

I've checked the permissions on this directory and it seems to be OK as well as all the sub-folders.

What concerns me is seeing the literal "MembersPath" rather than something signifying a variable of MEmbersPath, so maybe it is looking for something called MembersPath?? Not sure.

Can someone help me understand where this is coming from and why.

Thank you very much.