I've got the Pro version and yes I added the Pro launcher to my custom binary options in coppercube.
Have the parameters changed in ccbGetClosestNode as the message also points to invalid or missing parameter ?
If you say you can run the demo without problems using the latest API then must be something I've not setup correctly.
I get surface sounds for the terrain and plants but not for the objects platforms wood, metal etc.
The original demo executable works fine but when compiling a new binary with the latest API that's where I get the error messages.