Hey, Sorry, I tried to sent only the relevant parts of the example, but the part where the error was, was left out.
I defined the function, used as callback like this: class SomeClass: def callback(param): ... So I forgot the "self" parameter, and therefor the callback had a different number of parameters than I expected. Thanks for the effort! Nathan -- http://mail.python.org/mailman/listinfo/python-list