Comment # 25 on bug 1174406 from Robin Klitscher

(In reply to Larry Finger from comment #18)
> Thanks. As expected, the logs show a permissions problem. Finding why that
> happens in the code gets a bit more complicated.
> 
> Where did the VBoxSVC.log come from? I could not find that on my machine.
> 
> What is the output of 'VBoxManage list usbhost'? If that shows nothing, then
> run 'strace VBoxManage list usbhost >> host_list.txt 2>&1' and post
> host_list.txt.

As mentioned in my OP, in Leap 15.2 the command ���VBoxManage list usbhost��� also
returns <none> when invoked as a user.  But when it���s invoked as root, it
returns a long list of USB devices.  

Circumstantially, this seemed to hint at a permissions problem.

Beyond that, when I first installed Leap 15.2 about a month ago (fresh install,
not an upgrade), I had a problem with the vboxusers group.  Briefly, the
VirtualBox installation, the command <groups> in a terminal and the YaST GUI
all thought the vboxusers group was missing.  Inconsistently, however, the
command <groupadd> in a terminal and the content of the file /etc/groups
thought it already existed.  

I posted this to the opensuse@opensuse.org list, and David Rankin suggested
that I might try gpasswd -a robin vboxusers.  I did, and it worked.  I don���t
know enough to know if this might be related to the USB difficulty in
VirtualBox, but I wondered if it might be relevant in some way?