IPod stopped sync. just sync when you plug another USB device, e.g pendrive

As weird as it may seem all my iPods (i have 2 old Nanos, 2 new Nanos, one Shuffle and one Touch)stopped syncing. iTunes recognizes them without a problem. I can configure them to sync to a particular playlist but nothing really happens.
After a lot a work (plugged them in another PC to have 'em erased and all; reinstalled iTunes 9, etc) I just found out the strangest behavior: if I click Sync it takes a long time and nothing really happens. If I do it again anfd plug another USB device (like a pendrive) then sync goes smoothly.
Not sure why.. all I know is that I love the hardware but hate the software.
Maybe if I reinstall my PC the issue will go away...
Any ideas???
<Edited by Host>

It's probably not a problem with the shuffle.  Your computer's USB bus may not be providing enough power for all of your connected USB devices.  A typical USB mouse and keyboard are low-power devices, so you must have other devices connected...?  An iPod, because it charges battery from the USB port, is a high-power device.
I use a powered USB hub.  The hub has its own power supply.  I have the hub connected to the computer, and most of my devices, like iPods, iPhone, flash drives, etc. connect to the hub.  I use the USB ports on the computer for things I leave connected more or less permanently, such as printer and external drive.
Since the hub has its own power supply, devices connected to it do not draw power from the computer's USB bus.  So that is important.  Some cheaper USB hubs are not self-powered; they are powered by the computer's USB port.  I use an older version of this one
http://eshop.macsales.com/item/NewerTech/USB2HB7PRO/
but there are many options.  Just get one that has its own power supply.

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