The installer misidentifies the STB Velocity 4400 card as an Nvidia RIVA 128, it's an Nvidia RIVA TNT. The card doesn't work with the X driver that is chosen by the installer. Xconfigurator does get it right, so its possible to configure X after the installation is completed. There should be a way to override the installer's choice and pick from a list.
That shouldn't happen; the installer and Xconfigurator should detect the card as the same thing. What does 'lspci -v' say on your system?
Lack of reply, closing bug. Next release allows card override, but we'd still like the PCI information so we can correct the X server mapping.