In the past, I've used to use the USB capture option in VirtualBox frequently due to using some software that used a USB dongle for licensing. I have a new laptop (same OS as my old machine - Windows 7) and cannot get USB capture to work for any device.
I'm troubleshooting with a regular USB thumb drive. VirtualBox actually claims to have captured the device, but the guest OS (also Windows 7) does not recognize it. Additionally, the VirtualBox
Devices -> USB menu does not show a checkbox beside the supposedly captured device. It's not visible in the host OS, so it is at least partially working.
I've updated to v.5.1.8, installed the Extension Pack / Guest Additions, and also tried creating a USB filter for the device (in the past I could just select it from the
Devices -> USB menu to capture/release it as needed), but nothing has resolved the issue.
One final detail - there is no way to release the captured (but invisible) device from the VM. Clicking on it in the
Devices -> USB menu opens an error dialog saying the device "is busy with a previous request. Please try again later."
More info: I've also discovered that VirtualBox continues to claim the device is captured even after the device has been removed from the host computer and the VM rebooted. It appears that the only way to clear it is to reboot the host.