Develop and Download Open Source Software

(Cross-posted to rubycocoa-talk and rubycocoa-devel. Apologies for spam.)

The other day I found out that RubyCocoa's irb (1.8.7 on Snow Leopard,
at least) uses libedit (Editline) instead of readline to provide line
editing functions. I created a ~/.editrc file with key bindings to
match my ~/.inputrc (for readline), and they seemed to work just fine.
However, yesterday I noticed that none of my new key bindings work
anymore. The ~/.editrc file is still the same. What could have
changed? How can I make it work again?