[tex-live] Problem with TeX Live 2009's mpost + mpost.mem

[GG]

Hi Taco,

First of all, thank you for your work in the tex and metapost field !

I have with Texlive 2009 the following issue. I beg your pardon to 
bother you with that !

I don't manage to have a live metapost session. Look at this :

$ mpost -mem=mpost
This is MetaPost, version 1.208 (kpathsea version 5.0.0)
**
Please type the name of your input file.
**mpost.mem
! I can't find file `mpost.mem'.
<*> mpost.mem

Please type another input file name: mpost
(/usr/local/texlive/2009/texmf-dist/metapost/base/mpost.mp
(/usr/local/texlive/2009/texmf-dist/metapost/base/plain.mp
Preloading the plain mem file, version 1.004
! Redundant equation.
<to be read again>
                    ;
l.324 mm=2.83464;
                        pt=0.99626;        dd=1.06601;      bp:=1;
? x
Transcript written on mpout.log.


I tried mpost "&mpost", mpost -mem=mpost, no possibility to have a live 
session. However the command mpost -mem=mpost foo.mp functions.

What can I do ?

Sincerely yours,

Gérard.