thx @ rahner for the hint with the change in gt.func.inc.php - everything works fine now

thx a lot BUT a new thing (i don't want to call it an error )
the GT mod seems to be right for example the headlines of "normal" articles (top articles) but NOT for article listing...
i've used the GT RT in headlines of articles, but if the article should be shown for example on the mainpage in the teaser listing, the article disappears and breaks the whole pagedesign... i thought maybe the template of the article listing is the problem so i removed the h1 tag around the headline but nothing changed - maybe the GT mod and the TEASER_EX mod don't like eachother and block some functions?? just guessing
any ideas what happened? or is it like that, use the GT RT only for top articles???
thx for answers and suggestions in advance

... it's not bad luck, it's a bug ...