I am seeing the exact same behavior, but did not see any error about disk space (have at least 80GB free).
$ pinata diagnose -u
OS X: version 10.11.3 (build: 15D21)
Docker.app: version v1.11.0-beta7
Running diagnostic tests:
Error docker ps: timeout after 10.00s
Thread 6 killed on uncaught exception Misc.Failure
Error docker ps: timeout after 10.00s
[ERROR] docker-cli docker ps failed: Misc.Failure
[OK] docker-cli
[OK] Moby booted
[OK] driver.amd64-linux
[OK] vmnetd
[OK] osxfs
[OK] db
[OK] slirp
[OK] menubar
[OK] environment
[OK] Docker
[OK] VT-x
Docker logs are being collected into /tmp/20160418-125922.tar.gz
Most specific failure is: docker ps failed: Misc.Failure
Your unique id is: 06B524AA-81A3-4A51-A086-30F62D0CDCE5
Please quote this in all correspondence.
$ pinata diagnose -u
OS X: version 10.11.4 (build: 15E65)
Docker.app: version v1.11.0-beta7
Running diagnostic tests:
Error docker ps: timeout after 10.00s
[ERROR] docker-cli docker ps failed: Misc.Failure
[OK] docker-cli
[OK] Moby booted
Error docker ps: timeout after 10.00s
Thread 6 killed on uncaught exception Misc.Failure
[OK] driver.amd64-linux
[OK] vmnetd
[OK] osxfs
[OK] db
[OK] slirp
[OK] menubar
[OK] environment
[OK] Docker
[OK] VT-x
Docker logs are being collected into /tmp/20160418-172046.tar.gz
Most specific failure is: docker ps failed: Misc.Failure
Your unique id is: 05AFA25F-5014-45AE-BB43-542535CFDF8B
Please quote this in all correspondence.