Hello,
PPCHTeX seems to be broken in the latest ConTeXt beta version.
Here an example (copied from the manual):

\usemodule[pictex,chemic]
\starttext
\startchemical[scale=small,width=6000,height=6000,frame=on]
  \chemical[SIX,SB2356,DB14,Z2346,SR36,RZ36] [C,N,C,C,H,H_2]
  \chemical[PB:Z1,ONE,Z0,DIR8,Z0,SB24,DB7,Z27,PE] [C,C,CH_3,O]
  \chemical[PB:Z5,ONE,Z0,DIR6,Z0,SB24,DB7,Z47,PE] [C,C,H_3C,O]
  \chemical[SR24,RZ24] [CH_3,H_3C]
\stopchemical
\stoptext

log-file and dvi-file are attached.

Greetings, Peter

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