Configuration Menu in backend apears as if it had no CSS

[MarcoFox]

So, I'm pretty sure this wasan't suposed to happen.

Right now, whenever I go to the configuration menu to change something, it looks like in the attachment. I can't even change anything because the page "ends" after that menu listing.

I didn't do any structural change to any joomla or virtuemart file recently. I also tested it on other browsers, cleaned cookies, tried with diferent admin user, nothing changes.

I'm running Virtuemart 2.0.1 and Joomla 2.5.7. And yes, it used to work with no problems before, I have been working on this site for about a month or so.

What's the cause for this?

Thank you.
Marco Roberto.

[attachment cleanup by admin]

[MarcoFox]

Anyone? I really need help with this.

I can't change anything while this is happening. At least try to point me to what might be wrong so I can research a bit more.

Thanks.