Gnome3 startup cannot progress beyond stage of black screen

[maskor maskor]

Dear all,

I am running x86_64 FreeBSD 9.1-RC1 with NVIDIA 8600 GT graphic card (driver version : 304-51 provided by x11/nvidia-driver port).

I want to use Gnome so I have installed gnome 3 from Marcus recommendation.

At startup gnome 3 is launched but stays for ever at stage of black screen with watch form cursor without to reach the stage of gnome 3 login window.

I need your help to fix that problem.

Thanks

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