I installed ruby 1.9.2 with RVM, but when I type “ruby -v” is telling me the ruby v I have is 1.8.7 (mac)?

Installing rubies does not make them the executable version of ruby. RVM will only make ruby the 1.9.2 version if you tell it to, with rvm use 1.9.2 or rvm use 1.9.1.

Without actually looking at your system, I can't say for sure what is happening, but it would appear that you skipped the RVM Post Install step (see RVM Install page, which is what loads it into your shell session.

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