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Ah, that must be the problem. My packages seem to be quite old. I can't download a new version where I am right now, but I will try at home this evening. Thank you so much for helping me!

When compiling your code I got these errors:
! LaTeX Error: Unknown option `demo' for package `graphics'.
! LaTeX Error: Unknown option `labelsep=none' for package `caption'.
I use pdfTeX, Version 3.14159-1.10b (Web2C 7.4.5)

When removing the options and using this code:

\documentclass{article ...

Thanks for helping me!
It still doesn't seem to work though, I still get "Figure 1:" as caption instead of "Figure 1". Maybe I'm doing something wrong.

Hiya,

I have a problem with figures. I want to make numbered figures I can refer to but I don't want my figures to have captions except for the number. So the caption should be "Figure #".
Now I tried to use \caption{}, but that produces "Figure #:". So my question is basically: how do I get rid of ...