vboxdrv_enable="YES"
add path 'usb/*' mode 0660 group operator
Failed to attach the USB device vendor 0x1483 product 0xc007 to the virtual machine win2k3_32_0.
USB device 'vendor 0x1483 product 0xc007' with UUID {b9788e2b-9e42-494f-8453-9a0d60fba728} is busy with a previous request. Please try again later.
Result Code: NS_ERROR_INVALID_ARG (0x80070057)
Component: HostUSBDeviceWrap
Interface: IHostUSBDevice {c19073dd-cc7b-431b-98b2-951fda8eab89}
Callee: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}
There is some weirdness with 5.1.6 and 5.1.8 (USB host to guest pass-through not working) but you can use 5.0.26 and it just works fine like 4x.
(...) our port is an unofficial hack of the Linux version to get it working on FreeBSD.(...)