Actually, I can't replicate this when testing here (7.0.23.0, Win 8.0), whether auto-unlocking or not. Pro does nothing till the unlock is performed (either via p/w or auto) which suggests (for me, at least) that Windows is not issuing double-signals, and Pro is not reacting twice to same single trigger. This works whether I set it to trigger on Label or Volume Serial (didn't try Hardware Serial, as I already had two 'successes', and HW Serial is a pain to isolate/identify).
I did wonder if you might have one or more of the profiles in the group also still set to trigger OnInsert of the same device. However, I tried that using a temp test group, and I can't get Pro to object that way either (but it could be a matter of timings that I didn't manage to replicate)
You could do worse than test this with a standard (non-locked) USB key and see if you get the same result? If so, something else is glitching.
I did wonder if you might have one or more of the profiles in the group also still set to trigger OnInsert of the same device. However, I tried that using a temp test group, and I can't get Pro to object that way either (but it could be a matter of timings that I didn't manage to replicate)
You could do worse than test this with a standard (non-locked) USB key and see if you get the same result? If so, something else is glitching.