Labels in TikZ are incorrectly interpreted

Question

I'm running into a weird problem with TikZ. The following code

\node (A) [label=45:$A$] at (p2) {};

is rendered correctly in one document, but incorrectly in another, larger document (which uses incidentally more packages, this is why I suspect some package clash.

Surprisingly, the label specified by the portion of the code 45:$A$ is rendered explicitly as 45:A, rather than being interpreted as A at 45°. There is no warning or error raised.

Any idea of where the problem might come from?

Answer 1

It is actually due to a clash with the package babel (see the manual). By using the command \shorthandoff before the tikz code, it works fine! For example, you could use:

\begin{tikzpicture}\shorthandoff{:}
[>=stealth']
...
\end{tikzpicture}