I'm running Mutt 1.5.21 on Mac OS X and have things running nicely against a Google Apps email account.
Sometimes when I invoke a key binding I will get an error to the effect that the binding is not known. But when I re-do the same binding, it then works. It's quite intermittent but frustrating nonetheless. Here's an example: in Index view, I hit ctrl-n and the status bar shows "key is not bound". I hit ctrl-n again, and this time I advance to the next message as expected. -- Richard Sandilands