" Has the electrode problem been solved? "
The issue seems to be Dr. Chen's paper and whether his assumptions of the aspect ratio for the plasma toroids, match the model of Clint Seward proposed device. Will the ion stability condition be satisfied to maintain equilibrium?
His device is not a "fusor" He uses a type of neutron gun to produce his toroid plasmas and acelerates them into each other for the fusion reaction :
http://www.electronpowersystems.com/...20prop.doe.pdf
Fuel: For the proposed 6KW home generator 2kg of hydrogen/boron per year
He feels , with funding , two to three years for a prototype.