Rubber 3.2.2 has just been released, which fixes a few more VPC-related issues, as well as an issue related to mounted volumes discovered and fixed by Ernie Makris.
3.2.2 (04/13/2016)
Improvements:
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[core] Default VPC configuration can now be defined at the cloud_provider level. <1f41e31>
Bug Fixes:
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[core] setup_volumes no longer fails for mount points prefixed with "/mnt" (e.g.: "/mnt2", "/mnt3", etc.) <bd3fbbd>
[core] DNS entries are no longer created for instances with no external ip. <87a2501>
[core] Additional/custom EBS volumes now work for VPC instances with no external ip. <7b62443>