hmm, i think i had some problems with my via c3 as well when going 3d. i think it is a combination with some boards and this cpu.
best is to try a p3 as you mentioned to be sure.
added
http://www.hwbot.org/hardware/motherboard/g41_es2l
click here on the "recalculate your best submissions" symbol to recalculate the cups. it should work then.
http://www.hwbot.org/community/user/overpaqd?tab=options
partially done. i'm not finished completely yet. i think the missing cpus will be added when someone will request it.
btw. you have some errors there
p3 933 is 2 times the same category you linked.
when you click on the "more" tab at your submissions you can edit\delete\etc. your result.
here's a how to http://www.hwbot.org/forum/showpost.php?p=61875&postcount=8