[Typo3] problems with using the captcha-extension

[Andreas Motsch]

Hello,
i have a problem with the captcha-extension:
using it in the tip-a-friend-extension makes no problems, so  i'm  
trying to use this extension  in my own extension i created with the 
extension kickstarter.
and now i get following problem:

if (t3lib_extMgm::isLoaded('captcha'))    {                          
session_start();
               print_r("THIS".$_SESSION['tx_captcha_string']);
               $captchaStr = $_SESSION['tx_captcha_string'];
               $_SESSION['tx_captcha_string'] = '';
           } else {
               $captchaStr = -1;
           }
the session-var $_SESSION['tx_captcha_string'] allway stays empty, so my 
conditions depending on $captchStr also dont work.
i looked for a long time to the code of the tip-a-friend and i think 
that there is no obvious different.
maybe you have an idea, how to get the session-var running.

thanks a lot!
andreas
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