[LAU] Problems with Sound/MIDI on Ubuntu

When I start rosegarden I get: rosegarden DCOPClient::attachInternal. Attach failed Could not open network socket DCOPClient::attachInternal. Attach failed Could not open network socket jack@ubuntu:~$ kbuildsycoca running... Reusing existing ksycoca kio (KService*): WARNING: The desktop entry file .hidden/kdiff3plugin.desktop has Type=Service but is located under "apps" instead of "services" kio (KService*): WARNING: Invalid Service : .hidden/kdiff3plugin.desktop And then the system freezes :( When I want to change MIDI driver in setting Qjackctl, my system freezes when I start qjackctl... :( I can open Qtractor and connect it to midi input (ALSA). I can open Zynaddsubfx,connect it to the midi port and make sound... Help needed here!