I have not used the Playbook's micro usb port since I got the rapid charger, which was before the OS2 upgrade. Today I plugged it into the regular charger (that came with the Playbook) but cannot get any indication that the unit is charging. I tried several different wall outlets, and since it was working fine the last time I used it, there is no reason to think the charger is the problem. Is there a Playbook software switch that I need to reset? Has anyone else experienced a non-functional usb port following the OS2 upgrade? The usb port is not damaged or physically broken as far as I can tell. Any thoughts or suggestions will be appreciated. Thanks,