Ok, found it my self... Just adding the solution here to help others...
Don't really understand what CAPTCHA is but it is just to comment out two lines in
.../components/com_rsgallery2/lib/rsgcomments/rsgcomments.php// Check if security check was OK
if ($checkSecurity == false ) {
//$mainframe->redirect( $redirect_url, JText::_('Incorrect CAPTCHA check, c$
//exit();
}
This should really be settable from the configuration page (atleast in the debug mode editing the config file direct)