Thanks for fielding that one, Kremmit.
I have been marking the ID numbers on the USB connectors as has been stated. Evidently, a couple must have gone out without being marked.
However, there is a way to tell.

If you look at the label on the chip, you will see a dot in one of the corners;
Device 1 = No Dot
Device 2 = Green Dot
Device 3 = Orange Dot
Device 4 = Blue Dot
If I can find the space, I'll see about putting a device number checkbox on the next batch of boards.
kiddk1:
If you are the individual that started having problems after removing his trackball for repair, I would look at your wiring. Chances are high that something in your wiring is shorting. If that isn't you, my apologies. It's difficult to connect screen names with real ones sometimes.
RandyT