qjackctl and qsampler freeze at launch

[Marcel Bonnet]

Hi folks.

I can't launch qjackctl and qsampler. Both apps freeze without showing
their window. The mouse still moving, but the desktop becomes unresponsive.
The only way to get things working is ctrl+alt+F[number] , login and kill
the process.

I tried configure qjackctl wihtout XUNIQUE option, but no success. I read
some reports about this problem on different forums.

Thanks in advance.

-- 
Marcel Bonnet