I've moved my docker location from my C:\ drive to another drive. I did this initially by removing the docker machine (docker-machine rm) and creating a new one ($ docker-machine --storage-path "D:\users\me\.docker\machine" create --driver virtualbox default).
I also set the environment variable MACHINE_STORAGE_PATH="D:\users\me\.docker\machine" which was needed to get docker to see the newly created machine.
Now when I run, for example, docker images, I get the following error:
Could not read CA certificate "C:\Users\me\.docker\machine\machines\default\ca.pem": open C:\Users\me.docker\machine\machines\default\ca.pem: The system cannot find the path specified.
As you can see docker is looking in the old location for the pem file.
I'm on windows 7 VirtualBox Version 5.0.14 r105127 Docker version 1.10.1, build 9e83765