Beta 23 issue fixed after reinstall

Expected behavior

Run my containers as before

Actual behavior

Consistent error when running docker commands (run, stop, rm): “open //./pipe/docker_engine: The system cannot find the file specified.”


Steps to reproduce the behavior

Installed docker 1.12.0, everything OK.
Added beta 21 (in belief it was beta 22), everything OK.
Beta 21 signaled download of beta 23 and I installed.
After installation, I ran docker commands which returned errors.
Uninstall beta 23 and reinstall fixed the issue.