Solved by myself:i removed pulseaudio, pulseaudio-alsa, kmix and veromix. Then i reinstalled and from terminal:rm -rf ~/.pulse*rm -rf /tmp/pulse*So it works all again! Sorry for the topic
I solved the problem. Pulseaudio didn't start due to permission problems: ~\pulse-cookie and ~\.pulse were owned by root. After fixing this permission issue and rebooting the system, pulseaudio started correctly and veromix works fine.