[NTG-context] no executesystemcommand any more?

Ahoi, with the latest beta I can't get my LilyPond module to work. It seems that it's not possible to execute any command. I tried \executesystemcommand, \write18 and the old \installprogram. What should work? As far as I can see, shell_escape is enabled. (And it worked before.) Additionally I tried to replace the texmfstart call with mtxrun. While this works: texmfstart --ifchanged="foo-lilypond-1.tmp" --exec bin:lilypond "foo- lilypond-1.tmp" this doesn't: mtxrun --ifchanged="foo-lilypond-1.tmp" --execute lilypond "foo- lilypond-1.tmp" probably because mtxrun doesn't create a md5 file. Greetlings from Lake Constance! Hraban --- http://www.fiee.net/texnique/ http://wiki.contextgarden.net https://www.cacert.org (I'm an assurer)