Languages make everything so complicated! I just discovered the autocomplete bit on my reference fields wasn't working - until I tried searching by another language, and then the results gave me a surprise:
My homepage, originally in French, has had an English translation added, but whilst editing in English, I had to search with the French title in order for the page to come up... with the English title! Here's how to solve this...
My site uses Entity translation and the Title module (which I usually recommend as the best way of making your site translatable), and this...