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Can anyone tell me of any known bugs/breaks associated with the Maxwell 64 bit upgrade from 1.6 to 1.7.1? (not the Maxwell Render plugin for 3ds Max - I'm talking about the upgrade to the full Maxwell install that you have to do in order to use the Maxwell Render plugin for 3ds Max).
My IT staff wants to know what to expect before they run the upgrade

The benefits far outweigh the drawbacks. In fact, I can't think of any drawbacks. Besides, with each new update, bugs are fixed. 1.7.1 is the best I've used. The sky system alone is worth the upgrade.