don't need cache anymore IF blizzard fixes this
http://us.battle.net/wow/en/forum/topic/9972357544
Vignettes are better, but only work for about a couple hours after a reboot before they are completely USELESS. I haven't done enough testing in beta to determine if fixed there. those servers reboot so often that it'd be hard to ID the bug there since they are much lower pop which means it may take a couple days before vignette IDs become too high, and by that time servers have probably rebooted, so no way to know if they fixed the IDs going out of bounds yet.