Hi,
there is an additional space in the end of the line 653 in supp-mps.tex
(latest alpha):
\immediate\write\MPwrite{verbatimtex \MPinputtranslation etex ;}
It causes e.g. wrong left border in
\startTEXpage
\useMPgraphic{dvere-sup}
\stopTEXpage
Vit Zyka