So, just to follow up - I fixed this, and it appears to have only been a problem on one machine.
This Gemfile would always hang:
When I removed the ":git" directive, and just let it pull the latest version of the Gem, no more hanging.
No idea why or what the root cause, still happened even if I deleted all bundler git cache and all references to the gem in the RVM tree and tried again.
.
Thanks,
-- Chad