Following the issue opened here: http://devnet.jetbrains.net/thread/436163 and discussed here as well: https://github.com/cldwalker/debugger/issues/18#issuecomment-5656915 ;
I'm still trying to get rubymine to work with debug functionality on ruby 1.9.3, and haven't succeded at it yet. Didn't really explain why your fork is not working in my machine, so I decided to open a new discussion specifically for it, as the "debugger" gem extension seems not to be an option.
So what happens is this: after i successfully update ruby to the 1.9.3 version (rails 3.2, rubymine 4.0.3), I try to start the server in debug mode with debug mode. I instantly get the following message: "The gem ruby-debug-base19x required by the debugger is not currently installed. Would you like to install it?" . After I press "yes", I start the server. It runs all runs well, until i double click left of a line to insert a breakpoint, and then rubymine blocks. I have to kill the process in order to start rubymine again. Can you tell me how can I solve this?