I'm not sure if anyone else is having this issue.
When I start Lesson 5, it asks to edit the routes.rb file to create a new route. OK, I can do that just fine.
Then the second step asks to edit the messages_controller file to include a new method/action "new". When I try to edit the file, it will not let me. Anything I input is automatically erased. If I go back to the files and re-open messages_controller, it will let me edit to complete the second step. However, I get tons of errors because now my routes.rb has self-edited itself to match the text/code of messages_controller file.
Eventually I can hit "Get Code" but then it completes the rest of the lesson for me, which isn't helpful (not that Ruby on Rails lessons actually explain what you're doing or why as you're doing it), but it won't let me go on to Lesson 6 even though everything is checked as "complete."