RVM seems to mix gems and binaries between ruby versions?

I just ran into the same problem. The answer is that spork is running using another version of ruby, likely for another ruby application. Rspec tries to connect to spork if using the --drb option.

Spork uses the version of rspec it already has loaded. Easy solution, stop the other spork process before trying to run rspec.

I've never seen RVM do that so I suspect something was preexisting then RVM was loaded into the system. Was Ruby 1.8.7 a system-install or were some of the gems loaded outside of RVM? If so RVM can't really do much to corral the pre-existing configurations.

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