Thank you for contacting R* Support. We've received several reports of incompatibility issues with Max Payne 3 and OS X Mavericks. We're currently investigating these reports, but don't have any additional information at this time.
We apologize for any inconvenience.
Rockstar support replied today regarding the Mavericks issue:
Happily it is working in bootcamp
Rockstar support replied today regarding the Mavericks issue:
Happily it is working in bootcamp
This is now resolved. Steam did an update and mp 3 now works hurrah !