"Arrange by..." options are greyed out in Finder's List View.

Hey there, just a quick one...

I'm having trouble arranging my files/folders by Name, Date Modified, Size etc when in List View. This is fine in my regular Finder window but I clearly remember being able to do when (for example) Saving, Opening and all other popup Finder windows in earlier versions of OS X.

I should also say that I do have TotalFinder installed but I believe it was a problem even without it installed.

Here's a pic to demonstrate what I mean. In normal Finder windows there is a little drop down arrow when you hover, making each catagory a button essentially. This is what it looks like when I'm trying to Open, Save As or something similar... Greyed out, essentially. Problem highlighted in yellow.

Any ideas, suggestions or general help you guys have would be greatly appreciated. Could it be just somethign as similar as a System Preferences option or even holding down a key etc? Cheers.