Magento ACP Category Manager Broken?

I'm having a strange issue in the ACP where the manage categories page looks like this: http://screencast.com/t/IcNbpP87 I'd really appreciate any insight you guys may be able to provide.

I've looked around for a couple days and am pulling my hair out.

Chrome Displays a “New Root Category” form but you are unable to click a category to modify it.

Firefox & Safari: Seems to return the proper data via ajax from the server, though it displays the information without parsing(?)

Looking at the source in firebug, it looks like data that isn’t bei开发者_如何学Cng parsed correctly within the otherwise correct <div id="category-edit-container" class="category-content"> Source reference: http://pastebin.com/Zz7pKajj

I’d appreciate any suggestion on how to potentially move forward and get this fixed up. Thanks!

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After going two day crazy with this issue in our case the solution was on the most unexpected location: It was the index.php that was corrupted the culprit. After removing some spurious code that seemed that was injected or by some way modified all is working as expected.

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If there is content before the doctype header you will get this error. Check for that.