I just installed this (on Ubuntu) and every time I hit return I have been getting the error:

ruby-newline-and-indent: Symbol's function definition is void: ruby-indent-command

 I could not find any reference to ruby-indent-command except in the changelog. It looks like at some point you changed
ruby-indent-command to ruby-indent-line.

 I changed line 60 in rails-ruby.el from
(ruby-indent-command)
to
(ruby-indent-line)

and this fixed the problem with auto-indent working whenever you press RET.