Password reset error

I just tested the password reset option by a new user called tester (yeah, I know, so creative).
I gave the user name (tester) and then clicked “forgot password?”
Next I am redirected to a page where I have to add the username or an email address.
In both cases (either user name or email) I do receive an email with a link. In that link is a key. Like this:

In both cases I follow that link and then I get a page with the warning:
Sorry, that key does not appear to be valid.

So something goes wrong here, although I have no clue what that might be.

Thank you for reporting this important issue.

The Forgot Your Password functionality is something that WordPress itself handles. Normally this error is a result of a User clicking the link, then trying to use it again. This link only works 1 time.

I would recommend posting a thread on the official WordPress forum for info on what might be happening here.

See: http://wordpress.org/support/

Will do that. I first do an upgrade to 3.5.1 and see if that does any good. Tx anyway.