CUPS problems

I've got some strange problems with CUPS. First of all, Yast2 printer configuration doesn't work and it hangs at 'Check Environment'. At the comand line of Bash, lpstat and lpq hang too, and I had to stop them with 'cntrl-c'. I tried to kill cupsd and then restart, but nothing changes. I tried to restart my box too. I'm not able to launch any print job. May someone help, please? Thank you, Fabio De Francesco