id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host 11251,USB not working at all (all devices are busy),Karagul,,"USB devices in drop-down list are ALL in ""busy"" state. If I try to attach one (a USB 232 converter in this example) I get the following error: {{{ Failed to attach the USB device Prolific Technology Inc. USB-Serial Controller [0300] to the virtual machine WinXP Devel. USB device 'Prolific Technology Inc. USB-Serial Controller' with UUID {1e04c48b-fcb2-4509-bfba-8ea06084b6be} is busy with a previous request. Please try again later. Result Code: E_INVALIDARG (0x80070057) Component: HostUSBDevice Interface: IHostUSBDevice {173b4b44-d268-4334-a00d-b6521c9a740a} Callee: IConsole {db7ab4ca-2a3f-4183-9243-c1208da92392} }}} Sometimes, instead, the device becomes ""captured"" but nothing happens (device is NOT attached) and retrying to attach it yields the same error as above. This does NOT seem to happen on linux host. Log is attached. ",defect,closed,USB,VirtualBox 4.2.4,obsolete,,,all,Windows