I got something similar when I installed the 3.x software on my MacBook Pro. It looks like the 3.x software introduced a check for potential conflicts on the USB bus. Ultimately they're probably the same components that you had before so you shouldn't notice any effect from them.
(Edit - check this post:
http://www.infekted.org/virus/showthread.php?t=31652)
I've had problems with sync after various update - nothing to do with the USB thing
Unfortunately it seems to be a fact of Virus life that some updates introduce issues. My advice is to keep the installers for your old versions that you know work well, and if you hit a bad syncing update, then roll back.
This really spoils my enjoyment of the Virus, and while I'm excited that there's another OS coming soon, I'm also a little saddened that they never seem to iron out the issues in the current OS before moving on.
Cheers,
Maurice