Updates- To get the proper HTML coloring to show up in Rails files you need to go to Edit > Preferences > Code Hints. Click on the Tag Library Editor link, then click on the HTML Folder at the top of the tree. Below turn on the checkbox for Rails RHTML, Rails ERB, and Ruby.
- Do not add file extensions to the Edit > Preferences… > File Types / Editors > Open in code view list. This will cause the Split and Design views to stop working for these file types.