I'm using Txmate 1.5.10 on Lion. I've always been able to run Ruby programs from within Txmate, now I can't. I've changed a few things in my set up, though, so that might be the reason (?). First I downloaded Ruby 1.9.2 from RVM and I modified my path in .profile as follows: PATH=$PATH:.:~/.rvm/rubies/ruby-1.9.2-p290 export PATH Could that be the reason I'm having problems?