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For the benefit of other people having similar problems with layering in PGF/TikZ, I'd like to point out that the reason for the original poster's error was the erroneous spaces in the \pgfsetlayers command.

Replace:
\pgfsetlayers{background, main, foreground}
with:
\pgfsetlayers{background,main ...

Hello,

I want to draw a diagram, composed of boxes and text, using the longtable package. (Perhaps this is a bad idea in the first place, but unless it's really impossible, I'd like to stick with this approach.)

Here is my package, called 'ribbonprooftest.sty', that I have written to do this ...

Bravo that man! Perfect solution. Thanks very much indeed!

Hi Guys,

I want to write some arrows that are labelled above and below. I'm using the \xrightarrow command, which when used like this:

$x \xrightarrow[below]{above} y$

gives something like

above
x -----> y
below


However, I want these to be set within a paragraph of text, not in equation ...