[arch-general] zsh and ssh just fills my RAM, not doing anything else

I have a very nasty problem, which started around the time, arch changed its locale configuration. i cannot use ssh in a zsh session. All it does is filling my RAM until the computer stalls. If i run the very same ssh command in a bash session, all is working fine. I tried with blank config files too - here it gets even more odd. With a blank config file it has the same problem in gnome-terminal, but suddenly works in urxvt. This is very annoying, since i dont like bash too much, but i am forced to use it now. Also i have absolute NO plan where to start searching for this issue. Regards, Rasi