Comment # 22 on bug 1174406 from Larry Finger

Your empty usbhost list when running as a regular user is the problem. On my
system, there is no difference when I run the command as root. I was hoping
that would find some command that showed a lack of permissions, but no such
luck.

It has been a slog, but I compared your hostlist.txt with mine. The first real
difference is about 60% through the file. Your system fails a connection:

connect(5, {sa_family=AF_UNIX, sun_path="/tmp/.vbox-johannes-ipc/ipcd"}, 106) =
-1 ECONNREFUSED (Verbindungsaufbau abgelehnt)

On my system, that command succeeds. Please check the permissions on
/tmp/.vbox-johannes-ipc and /tmp/.vbox-johannes-ipc/ipcd with

ls -ld /tmp/.vbox-j*
ls -l /tmp/.vbox-j*

The first one should show a directory belonging to johannes:users as follows:

drwx------ 2 johannes users 4096 Jul 28 12:36 /tmp/.vbox-johannes-ipc

and the second should show two files as follows:

srwx------ 1 johannes users 0 Jul 28 12:36 ipcd
-rw------- 1 johannes users 5 Jul 28 12:36 lock