Hah, found it – its an IE bug. Apparently IE doesn’t handle MIME type options properly and takes the first option it finds, which in this case was OPML instead of HTML. I’ve switched the order and now it should work just fine.

NoMethodError in Feeds#index
Showing app/views/feeds/index.opml.builder where line #7 raised:

You have a nil object when you didn’t expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.each

Extracted source (around line #7):

4: xml.title “Journal Feeds from JOPML”
5: end
6: xml.body do
7: for feed in @feeds
8: xml.outline(“title”=>feed.title, “text”=>feed.title, “xmlUrl”=>feed.url)
9: end
10: end

RAILS_ROOT: /var/rails/jopml

etc