unfortunately, none of your suggestions fixes the problem (which isn't really one anyway as I never use the lines representation). If I set both ati_bugs and nvidia_bugs, the display is completely messed up.
I'll update to Fedora 9 once the new ATI driver is compatible.
Thanks for compiling & testing the current open-source code! I think this
is a driver issue. Some card/driver combinations object to being fed
geometry too fast in immediate mode. Please See if one or both of the
following settings helps: