Quack, This is quite old but I have no idea if the problem persist. Sorry you did not have any reply at the time.
I do not use fcgi, so I never encountered such error. I did not find any similar issue in the Redmine tracker either. If you're still having this problem and can reproduce it with 4.0.4, please tell us and have a look at the server.errorlog file to see if there's more info please.
Regards. \_o< -- Marc Dequènes
