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I have two USB ports at the front of my Mac Pro. They both seem to be working fine, as I have tested my iOS devices and other hardware on both.

The issue is that I can only mount one iOS device at a time. If I try to mount the second device it does not appear, until I un-mount the first.

This is strange as I usually load two devices (an iPhone and iPad) without any issue.

Any ideas?

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What if you plug one in the back of the Mac Pro? –  GEdgar Aug 15 '12 at 3:01
    
same thing actually. Only one device loads. –  Mrwolfy Aug 15 '12 at 6:47
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