Can't connect Samsung Note 3 to a Windows 7 VM in VirtualBox
I found the solution:

Check the VirtualBox version and go to their website and update the extension pack.

This is on a Fedora 20 system and after updating the VirtualBox "extension pack" and uninstalling all the all the "Universal Serial Bus controllers" drivers in "Device Manager" of the guest(Windows 7), and then shutting down the guest and rebooting the host. Everything is back to normal and working. Yei