What supplyvoltage are you running it? Currently it is in class AB mode!! Jan changed the design, but got the logic wrong. He changed it thinking that class T mode was logic high and added another jumper to 'ensure' it would always be in class T mode when forgotten. In fact it is alway in class AB mode and now BOTH these jumpers need to be closed to have it operate in class T!!!
In class AB mode the MAX supply voltage is 16vdc and higher voltages can damage the Tripath chip!
P.S. the second jumper that needs to be closed is right next to the dil chip (the two little holes)
Pics can help a lot to diagnose something from any place on the globe...