This isn't a Python problem -- it's a bug in Webware.
If you put a print statement at the end of UnboundMethodError.py you'll
find that the module actually gets imported multiple times. This
somehow causes a mismatch between the instances and the classes that
triggers the error you're noticing.
Thanks Geoff!
I downloaded your fix and by putting in the print statement verified I was
getting multiple copies of UnboundMethodError before the fix and only one
after the fix.
If I understand the problem correctly, the className.methodName(self,...)
form of call does a global lookup and