Problem using LaTeX in MetaPost

Hi,

I'm using MiKTeX version 2.9 and MetaPost version 1.504. I'm no longer able to use LaTeX in MetaPost. The file

verbatimtex
%&latex
\documentclass{article}
\begin{document}
etex

input latexMP;

filenametemplate "%j-%3c.mps";

beginfig(1);

  draw (0, 0)--(150, 150);
  label(btex $A$ etex, (0, 0));
  show mpversion;

endfig;

verbatimtex
\end{document}
etex

end
fails because LaTeX commands aren't recognized. The error file is

This is TeX, Version 3.1415926 (MiKTeX 2.9) (preloaded format=tex 2012.2.7)  7 FEB 2012 10:28
**mp632087.tex
(C:\Personal\MetaPost-Manual\1.005\Graphics\mp632087.tex
! Undefined control sequence.
l.2 \documentclass
                  {article}
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.3 \begin
          {document}
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

[1] [1] )
Output written on mp632087.dvi (2 pages, 340 bytes).

I've also tried the option -tex=latex and the file compiles OK, but when I use YAP, the following error occurs:

MiKTeX Problem Report
Message: Some PostScript specials could not be rendered.
Data: Error: /undefined in cmmi10
Operand stack:
   --nostringval--   PermitFileReading   --nostringval--   PermitFileWriting   --nostringval--   (A)
Execution stack:
  
 %interp_exit   .runexec2   --nostringval--   --nostringval--  
--nostringval--   2   %stopped_push   --nostringval--  
--nostringval--   --nostringval--   false   1   %stopped_push  
 1914   1   3   %oparray_pop   1913   1   3   %oparray_pop   1897   1  
3   %oparray_pop   1787   1   3   %oparray_pop   --nostringval--  
%errorexec_pop   .runexec2   --nostringval--   --nostringval--  
--nostringval--   2   %stopped_push   --nostringval--
Dictionary stack:
   --dict:1166/1684(ro)(G)--   --dict:0/20(G)--   --dict:78/200(L)--   --dict:95/300(L)--   --dict:42/200(L)--
Current allocation mode is local
MiKTeX GPL Ghostscript  9.00: Unrecoverable error, exit code 1

Source: Libraries\MiKTeX\Dvi\Ghostscript.cpp
Line: 372
MiKTeX: 2.9
OS: Microsoft Windows XP Professional Service Pack 3 (build 2600)
Invokers:
 explorer/cmd
SystemAdmin: yes
PowerUser: no
Root0: C:\Documents and Settings\OSY98\Application Data\MiKTeX\2.9
Root1: C:\Documents and Settings\OSY98\Local Settings\Application Data\MiKTeX\2.9
Root2: C:\Documents and Settings\All Users\Application Data\MiKTeX\2.9
Root3: C:\Program Files\MiKTeX 2.9
UserInstall: C:\Documents and Settings\OSY98\Application Data\MiKTeX\2.9
UserConfig: C:\Documents and Settings\OSY98\Application Data\MiKTeX\2.9
UserData: C:\Documents and Settings\OSY98\Local Settings\Application Data\MiKTeX\2.9
CommonInstall: C:\Program Files\MiKTeX 2.9
CommonConfig: C:\Documents and Settings\All Users\Application Data\MiKTeX\2.9
CommonData: C:\Documents and Settings\All Users\Application Data\MiKTeX\2.9


I posted the problem in metapost@... and the people that answered the mail suggested to file a bug report.

Kind regards,
 
Carlos Mallén
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