Hello.
I have a problem - I cannot connect USB devices my guest OS. When I select one, I can hear the "USB disconnected" sound from the host, but the guest doesn't see it. When trying to connect again, it comes up with the following eroor message:
Failed to attach the USB device Western Digital My Passport 0741 [1025] to the virtual machine XP Mode lel.
USB device 'Western Digital My Passport 0741' with UUID {3b0e8c57-573e-4089-a0d9-2d2a63ba5ff2} 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 {8ab7c520-2442-4b66-8d74-4ff1e195d2b6}
In here, I tried an external hard drive, but the same error appears when trying connect a smartphone. I am running VirtualBox 4.3.20 on Windows 8.1 (64-bit), guest OS is Windows XP Professional SP3 with Guest Additions installed.