Re: `y-or-n-p' does not wait for input - assumes `n'

[Richard Stallman]

    FWIW, I have been bothered by switch-frame events when trying to debug some
    of my code that reads events. Because the debug buffer is in a separate
    frame (I use non-nil pop-up-frames), just getting to the debug buffer causes
    a switch-frame event, which can sometimes throw things off.

Can you tell us how to reproduce this?  Then we could fix it.