2008 GT Avalanche 1 Broken!

I finally upgraded my Apollo Ascension to a 2008 GT Avalanche 1 tonight. Got it home and did 2 laps in the backyard to feel it out. It had a click sound thru the gears and then "Bang", the rear derailer holder snapped in two (forged aluminium/steel? - Broken). It looks like the chain wasnt set up right and the holder is definitely not up to grade. Lucky I wasnt half way out at Manly Dam or Cascades. Anyway back to the shop tomorrow - bugger as I was going out tomorrow at 6:30am, which I still will on the Apollo. These things happen!!!