For some reason I'm getting this error:

Unable to connect via usb

device storage in use

I get this when I plug in to my computer and select Mass Storage mode

It works perfectly if I reboot and plugin. But if I unplug and replug, it gives the above error till I reboot again. I tried ejecting before unplugging in Windows, but that doesn't change the behavior.

I have not installed any SW for USB control.

Anybody else seen this?