I observed errors in the Anaconda installer,but in my case, when imake the partitions prior, the errors no more occurs.
seems that Joost solved some of these errors.
video driver: if you have an antique GForce 8600, use only the older drivers series 340.
for more easy use, mask the driver and the kernel and no more upgrade kernel and driver.
Installer Issues via Installer -- Not for global upgrades or upgrading individual packages -- ONLY ISSUES WITH INSTALLATION OF THE OS -- Can't get Sabayon installed, than post here, otherwise use correct forums