In my case I sent activation emails to 400-500 users who forgot to activate their accounts. But I have serveral reports from different users that the activation link is missing the confirm code... So, I had to activate these manually in the admin backend
The link in the emails looks like this:
www.mysite.com/index.php?option=com_comprofiler&task=confirm&confirmcode=
It seems to be truncated after the "confirmcode=".
No answer to this problem in the joomreem forums. Does anybody here have an idea what is the problem ?