I'm faced with a strange problem that I've never heard of, and I'm not able
to resolve it by myself..

All of a sudden, my pc doesn't react when I try to add accents to vowels
like the e or i. Nothing has changed in the language settings, nor in the
keyboard setup. I really don't get it. This problem is present in all
applications.

I alternate between keyboard layouts (Spanish/Danish), and the problem
affects both.

If anyone has any suggestion or experience with this problem, please let me
know- I need the accented vowels!