[NTG-context] beta: \abortinputifdefined (mkiv)

Hi, my testing yesterday was only limited to a very small test file (overprinting test). i had no problems with that, but any approach with one of my graphics directly ends with ! Undefined control sequence. l.1 \abortinputifdefined oops, is syst-gen.tex no longer part of the mkiv core? i installed the beta two times (cleaned up texmf-context) and also tried the luatex binary from yesterday. no success so far. also no fun with mkii. looks like shading specials are broken. - Peter