When using KLC to connect to an Apple OSX machine, you see an SSL error on various pages, including, but not limited to Terminal and Remote Control.
This is a known issue caused by the way that KLC established connections to OSX agents over SSL
WORKAROUND / RESOLUTION
The workaround is to use the "normal" remote control via the Remote Ctrl Tab -> Control machine pages
This issue is being addressed in the replacement for KLC.
There is no current release date for this.