simple gdm greeter unresponsive mouse

[kenn]

 I have ZorinOS 5.2 version of Natty 64 bit (Ubuntu). I set up 5 seconds delayed autologin, while starting-up, mouse is freezing on simple gdm greeter and I can't move pointer on the screen till desktop is loaded, I inserted 30 seconds of sleep in the script at /etc/gdm/Init/default, delayed login works but it also keeps me waiting 30 seconds on every logout. I hope you help me.
All the best.