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Out of interest, have you tried running any other Unity games on those machines?  Do you have similar problems, or is it just with Sunbeam?  I'm wondering if it could be the particular version of Unity I used or if it's a general problem.  I could try rebuilding the game in a different version of Unity to see if that makes a difference.  I was planning on issuing an update at some point anyway, so I'll bring that forward if we can't find any other solution.