Since ±5 hours, RenderKit totally stopped working on my Mac, apparently because of a bug in nl_license_manager.
Full description of the problem :
1. Having previously installed my RFRK2013 license, I start nl_license_manager

2.Then I try to render a frame with the RFRK mesh plugin for C4D. Unfortunately I get this error message every time :

3. Meanwhile nl_license_manager displayed this error message...

4. ... curiously the activity monitor don't show up any other nl_license_manager process

I've followed these install instructions, I've tried to reinstall nl_license_manager, I've tried to reinstall the C4D plugin, I've tried to restart my Mac...
OS X 10.9, RFRK C4D v1.1.4, nl_license_manager 1.8.0.0019, single standard RFRK2013 license without expiration date.

Is there any way to simply copy my license in the plugin folder?