Hi

I am using context to run a metapost graph. I am however unable to insert a label with \frac, since this is not pure Tex but Latex. This seems to be a known problem for metapost:
-Seems for metapost only,  one should add %&latex (http://ryanmlayer.wordpress.com/tag/metapost/).
-I saw also one post where it was mentione done should add \setupMPpage[offset=1pt]  (http://www.tug.org/pipermail/pdftex/2001-March/000429.html). I tried, but did not work however...

Any idea how I should do? Find below minimal example, that does not work on my computer when compiling with context...

Thanks!!

Matthieu

\starttext

\setupMPpage[offset=1pt]

\switchtobodyfont[10pt]

% Beginning MetaPost graphic
\startMPpage

label.top(btex 1.4 etex scaled   1.00, (10, 10));

label.top(btex $\sigma_t$ etex scaled   1.00, (0, 10));

label.top(btex $\displaystyle \frac{\sigma_t}{a}$ etex scaled   1.00, (1, 1));

\stopMPpage

\stoptext