[AUCTeX] Spelling not working in AUCTeX

[Rasmus Pank Roulund]

Hey AUCTeX group,
I have a slightly odd problem. Aspell stopped working in my Emacs setup. 
It used to work, but I have not been using Emacs for a couple of weeks.
I use Aspell and it works in text mode, but whenever I switch to LaTeX 
mode, spelling stops working. I get the following error when I run 
ispell or flyspell from LaTeX mode

   "Error in post-command-hook: (file-error writing to process invalid
    argument ispell)"

I have got the following lines related to ispell in my dotemacs:
    (setq ispell-dictionary "dansk")
    '(ispell-alternate-dictionary "/usr/dict/words")
    '(ispell-program-name "aspell")

The odd thing is, that it works perfectly well in other modes such as 
text and html, but not in LaTeX (AUCTeX) or tex ("native" TeX mode).

Does anybody know, if AUCTeX has some local definition or argument for 
spelling commands?
Also, everything should be in the PATH.

I hope somebody will be able to help me out here. It is a bugger not to 
have a spell checker.

Thanks,
Rasmus