Hi Peter,
I have the a similar setup (STT8300 with CFW-8G) with a different scope, so the FOV is different, but you should be able to find a bright star by pushing the bright star off the top centre of the imaging CCD, sometimes there's a fair "gap" between the imaging and guide CCD.
It really looks like the guide CCD may be faulty, did you buy it in Aus? If so then the supplier should be able to take it back and test it for you at least.
Failing that, if you're ever in Melbourne...
Cheers
Stuart
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