Thanks for your suggestion,
i forgot to describe that i tried different newline seperators and for sure, different command line tools.
To be sure i put some logging code directly befinde the serialEvent() function.
johnwasser:
if (inChar == '\n') {
stringComplete = true;
}
Is is possible that whatever code is sending text is not sending the expected newline character?
Today i will try to use a clean installation of the arduino software, without my libaries.
I let you know later about the results.