createPDF error

When clicking 'Test Server Requirements' once the plugin is installed and activated, I get the error in the output window that escapeshellarg has been disabled on the server for security reasons.

I found four occurrences of it in createPDF.php and tried by simply removing them which seemed to work. I'm sure the function calls weren't put there for no reason so can you tell me if there's a workaround, or if removing them on a Linux server could cause a problem.

Thanks, Paul.