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Here is how the site 'breaks'.

From Quick Reply or from the Reply page, i type the following.
http://www.wowhead.com/?item=31051
Submit the form

It just takes me to a white page.

If I use the item tags and the item name, it works fine.

I even updated my power.js and updated the md5sum also
also tried using the external power.js too

Things seem really strange with your install file now. Post the old version please, that one worked, or add it back in the old post.

This one has two database tables added, wowitemstats and itemstat_cache, nothing is in the former and the later has some entries and a ton of empty entries