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I have some strange problem with my front panel. I have a bluetooth dongle plugged in to the front panel USB port (A) and the other port on this front panel is free. When I try to put a thumb drive to other USB port (B) I get "unrecognized USB device". However when I swap ports (Bluetooth to B, thumb drive to A), everything seems to work fine. What might be wrong?

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It would be helpful to give some information about your system (hardware, operating system, etc.) – Uwe May 6 '13 at 7:52
I have motherboard Gigabyte GA-Z77-D3H. Operating system: both Windows and Linux have problems. – connexion20000 May 6 '13 at 8:05

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