subscribe2; problem confirm request

I installed subscribe2 and it works perfectly exept that the link to confirm the subscribtion doesn’t work. The link: https://www.lentewind.nl?s2=1a25e85e8f9ee87f8d68faa21a0f6021019
I already tried to switch off all my plugins and use the default theme, but nothing seems to work.

Advise Anybody?

Bart