> I am running Emacs 24.1.50 (via git) with calc installed.
>
> I noticed that in Calc, hitting 'f ?' fails to display the help
...
> Could others try this out and see if the same problem appears in their
> installations as well.

I just tried it with the latest bzr source and didn't have the problem.
Do you still have the problem if you start emacs with `emacs -Q'?
Do some of the other letters have the same problem; does `g ?' work?