USB_Init() no longer calls sei() to enable global interrupts - this must now be done in the user application once all init code has run.

Projects/RelayBoard/RelayBoard.c

@@ -44,6 +44,8 @@
 int main(void)
 {
 	SetupHardware();
+	
+	sei();
 
 	for (;;)
 	  USB_USBTask();

Projects/RelayBoard/RelayBoard.h

@@ -41,6 +41,7 @@
 		#include <avr/io.h>
 		#include <avr/wdt.h>
 		#include <avr/power.h>
+		#include <avr/interrupt.h>
 
 		#include "Descriptors.h"