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Actually, that did the trick.

I hadn't deleted the aux files. Doing this removed the bad labelling.

Thanks
Hedinn

Well.

I added the code in the first post and compiled. All the label problems happened at this compilation (I had compiled just a minute before I added the code, and then everything was ok).
Then I removed the code and compiled again, but labels are still wrong.

The only difference in my whole ...

Hmm..

Searched the whole document. No "\thefigure" anywhere.

Hedinn

Hi.

Does anyone know how I can completely reset the whole figure labeling and numbering to default of documentclass book?

What started my troubles:
I use the subfig-package. With this the labels of my figures are in the form:
"Figure [chapter].[figure number]: [Caption]"
Labels of subfigures are ...