Some more input. Attached strace output from a successfull run with the cygwin-1.3.14 dll. What I can spot in the log is that when com4 is read it now has a read timeout of 1000 (vtime=1000), while in the unsuccessfull runs vmin was 0. Does that ring any bells ?
Ton van Overbeek
trace-1.3.14.bz2
Description: Binary data
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