Docker Toolbox fails to select VM, can't start DSS

I installed the Docker-Toolbox version on a Windows 7 (enterprise) with 16 GB of ram.

Boot2Docker configuration is Boot2Docker version 1.8.2

Oracle Virtual Box is version 5.4

Using the start.sh (Docker quickstart terminal) I always get the following issue.

===========SNIP================

Machine default already exists in VirtualBox.
Starting machine default...
Starting VM...
Started machines may have new IP addresses. You may need to re-run the `docker-machine env` command.
<<insert ASCII Whale icon>>
Boot2Docker version 1.8.2, build master : aba6192 - Thu Sep 10 20:58:17 UTC 2015
Docker version 1.8.2, build 0a8c2e3
docker@default:~$ docker-machine ls
-sh: docker-machine: not found
docker@default:~$ docker run -p 10000:10000 -d dataiku/dss
b28ba8d6e16fa1eb9fb28fe3d970205a0567d8ce488a588bbfebf409f22e8edd
docker@default:~$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b28ba8d6e16f dataiku/dss "/home/dataiku/run.sh" 6 seconds ago Up 5 seconds 0.0.0.0:10000->10000/tcp suspicious_nobel
docker@default:~$

===========SNIP================

I can run the VM directly from Virtual Box and get DSS to start - but this is kind of a pain and the Docker Quickstart Terminal should work fine.

Any known work around?

Thanks, Cliff.