Wowhead has some problem lately. We've had numerous threads on it lately, so you're not the only one. Chaud mentioned in one of the past threads (although now I can't find it) that it is an issue with the site itself and not browser or user specific.
Wowwiki is really outdated and mostly useless anyway. Use
wowpedia.org. I am not saying that just because it is the Curse version, but because it's actually accurate, updated, and it works. As I understand it, many of the original wowwiki people now work on wowpedia.
In lieu of wowhead, I would also suggestion
wowdb.com for basic database lookups.
MMOC is even having a contest to reward contributors. It doesn't have the years worth of comments that wowhead does, and lacks some features like 3D modeling, but can still be a valuable alternative resource.