[Typo3] Direct-mail: Invalid link in subscription mail

[Martin Rud]

Hi,

When a visitor subscribes to a newsletter an email with this 
comfirmation link is send:

http://mydomain.com/typo3/index.php?id=335&type=0&cmd=setfixed&sFK=approve&rU=15&fD[_FIELDLIST]=uid&fD[hidden]=0&aC=a3b95a36

When clicked it doesn´t confirm the subscription - only when the link is 
copied into the browser it works.

I think the link becomes invalid after "[_FIELDLIST]".

How do I solve the problem?

Regards, Martin