I am having this problem as well. In fact I had a working installation of an earlier release that was working fine on a Nvidia EVGA 6600 and after an upgrade to a new Nvida EVGA 8800 GTS this problem began. I am also using the DVI output and noticed this problem does not exist within the 32bit version of Gutsy.
I am having this problem as well. In fact I had a working installation of an earlier release that was working fine on a Nvidia EVGA 6600 and after an upgrade to a new Nvida EVGA 8800 GTS this problem began. I am also using the DVI output and noticed this problem does not exist within the 32bit version of Gutsy.