I have spent several days trying to debug auto-complete, it is working properly in Elisp mode, but when I go in Ruby mode it stops working. auto-complete-mode runs successfully, but the menu of candidates does not appear when I type the word or invoke the command auto-complete.
I installed auto-complete using package.el from melpa. I have not added any settings to my .emacs file.
What should I do to identify the bug?
I'm using Emacs 24.3.