I see two possibilities, and I haven't checked either.

1.  Did you restart emacs after installing R-3.0?  The aliases are defined
at start time.

2. R-3.0 is not a valid R-core name.  I have R-3.0.0alpha on my machine.
 At release, I will have R-3.0.0

Rich

On Fri, Mar 22, 2013 at 11:22 PM, Kasper Daniel Hansen <
kasperdanielhansen@gmail.com> wrote:

> Emacs 24.2.1, Ess 13.03 (same issue with 12.09-2)
>
> Usually, Mx R-$version allows me to start any R-$version, even for
> "weird" $versions like R-2.15.x.
>
> I now have a symlink to R-3.0 in my path, seemingly exactly as I have
> symlinks to many other versions of R.  But M-x R-3.0 does not work.
> Is there some kind of regular expression at work here?
>
> Best,
> Kasper
>
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