I downloaded the RubyMine 2.0 beta and am playing around with cucumber. I tried to set up a test project to learn cucumber, following the PragProg's Rspec book. When running the scenario in RM, I get:
Cucumber::Ast::Visitor is deprecated and will be removed. You no longer need to inherit from this class.
Error creating formatter: Teamcity::Cucumber::Formatter (RuntimeError)
I can run it in from the shell with no problem, getting expected results.
Mac OS X 10.6.1, MBP 17, 4GB, Locally compiled Ruby 1.8.7 installed in /usr/local/bin, along with gem and friends. Cucumber 0.3.103, rspec 1.2.8