[oXygen-user] prevent multiple instances on OS X

I'm launching oXygen 11.2 via a JavaScript in a web UI which calls /Applications/oXygen/oxygenMac.sh I've added the line -Dcom.oxygenxml.MultipleInstances=false \ to oxygenMac.sh, and have also added "-Dcom.oxygenxml.MultipleInstances=false" to VMOptions in /Applications/oXygen/Oxygen.app/Contents/Info.plist But even with these properties specified, I'm getting multiple instances of oXygen each time I open a file via the web UI. Details: - oXygen 11.2 - OS X 10.6.5 - JRE 1.6.0_22 Any ideas on how to fix this? TIA, Bob