So one issue with the 64bit version and the latest "numpty" is that the issue with the astrometry script and the rule changes in numpty about dynamic casting:

TypeError: Cannot cast ufunc add output from dtype('int32') to dtype('uint16') with casting rule 'same_kind'

So saving in a PNG for the tests was the initial work around but it looks like this can be done:
stackoverflow.com/questions/14269164/why...-computers-in-python

It appears that according to that comment that the change was reverted.. so perhaps a python/numpty update will sort it out. It looks like ".astype()" needs using in the script.

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