I have started Zimbra desktop (./zdesktop start), the daemon is running, in the logs i have no errors, just debug messages, but I cannot see the UI.

See the below for commands issued:
cd zimbraInstallDir
./zdesktop start
Starting zdesktop
bogdan@traian:~/zimbra/zdesktop$ nohup: appending output to `nohup.out'

the nohup.out is empty, and just debug msg on zdesktop.log.

Why is'nt the GUI starting?