Hey, I'm quite new to Zbrush, but I need a bit of help. As you can see in the picture, the pink shape at the back is a perfect square. I've resized the document to 1024x1024 and hit F whilst the square is selected. Not only is the square not filling the viewport, but the viewport isn't to scale! Why hasn't the document been resized to a square even though the axis are the same!?

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Framing the mesh doesn't frame it to the document, but the view. So you'll have to take Shabba's advice to zoom the document out with Document: Zoom Doc (or just hit Ctrl+0 to show the document at 50%, thenframe the tool and hit 0 to show the document at 100% again)