I did some tests and chat with phoenyx.
But he does not longer support icms, so I need someone else, how can help me, with this issue.
I put this line in the code:
1 Benutzer gefunden
Fatal error: Call to a member function getVar() on a non-object in .../icms/include/findusers.php on line 420
phoenyx reaction was:
"this makes no sense...
arraykeys($foundusers) delivers  => 6
why does $foundusers should not exist?"
So, here I stand now, knowing nothing to do :S
please help :)