Oops - temp code left in the XPLAINBridge project which prevented it from entering programmer mode.

Projects/XPLAINBridge/XPLAINBridge.c

@@ -166,8 +166,6 @@ void SetupHardware(void)
 	/* Re-enable JTAG debugging */
 	MCUCR &= ~(1 << JTD);
 	MCUCR &= ~(1 << JTD);
-
-	CurrentFirmwareMode = MODE_USART_BRIDGE; // TEMP
 }
 
 /** Event handler for the library USB Configuration Changed event. */