[Zope] Problem with ZServer

I´m having problems with zope 2.5.1 on W98 when crashes, the light is off, or not correctly shutdown. After that, I start the zserver but when I try to log in, the server crashes because of an error in logger.py in line 65, in maybe_flush, bad file descriptor. I lose my work and have to reinstall Zope. I tried to make something, removing temp and index datafs, z2.log, but only breach to log in in the server, but if i try adding or modifing objects, i recieve the same error. ¿Whats the problem?.¿Bug?. ¿Am i doing something wrong?