Did you make sure to set Edit → Input Devices → NetworkTablet to Screen? Other devices like a mouse can’t be used together.
Userspace driver for GIMP
Is it possible to create driver that will not require installation? Why can’t GIMP just listen on a port to accept events and draw them?
If this is implemented, I am sure it will work on Windows and Mac OS X too.
The driver is a user-space driver and does not need “installation”, but it needs to be run. I don’t like it to be limited to one application, too, so I won’t make a GIMP user-space hack for this.
But it’s a cool idea and feel free to make it, the protocol specs are in “doc” directory.