I'm using the following line in my application:
Thread(target = open_new(dest)).start()

dest is file path set by user.
Got this traceback with python 2.5:
File "C:\python25\lib\threading.py", line 460, in 
__boostrap
self.run()
File "C:\python25\threading.py, line 440, in run
self.__target(*self.__args, **self.kwargs)
TypeError: 'bool' object is not callable

Worked well with python 2.4 .
OS: windows XP 32 bit.
Searched for a similar bug report but couldn't find 
one, sorry if it already been reported.