I'm complete novice to Ruby and RubyMine (but not to IntelliJ). I'm just trying "Sudoku" game example from the first chapter of "The Ruby Programming language". It runs just fine, producing correct results. However if I run with debugger without any breakpoints it does not produce expected result (however it exists without errors). If I add any breakpoint as soon as it enters Puzzle class debugger disconnects and output produced is exit code 1. This is with latest RubyMine on Mac 10.6.2 Everything is at default. Help much appreciated.