From our analysis of this problem, it seems that NoMachine Beta is being used rather than the latest version (4.0.362). Check what version you are using and download the latest packages from our website.
You can also check the following topic which deals with issues reported on Mavericks.
https://www.nomachine.com/forums/forums/topic/maverick-not-supported
The topic was split into two individual issues which you can find linked there.