Bitchx and failure in creating new windows

[Gecco <gecco@kuba.ae.wroc.pl>]

Hi,
I've recently switched from slink to potato and installed my fav. irc
client bitchx plus screen of course. But I have a  problem with them. I
can't create new windows with /window create command. All I get is:

-:- Opening new screen...
-:- The screen is now dead.
child signaled with 11
Errno is 4
-:- Cannot create new screen!

But when I create separate windows (out of bitchx) with ^a c there's no
problem. 11th signal doesn't sound good, does it?
Do you have any clue?

Thanks in advance

Jakub Chmielewski