I don't have a Mac, but just a thought-you might try installing the Service Release:

poser.smithmicro.com/updates.html

Oh! One other thing-Poser won't start if another copy with the same serial number is running on your local network at that time, so make sure that it's not running on your laptop...

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"Oh - the manual says that? I have never read the manual - this must be why."
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