QFC strange problem

Hi! I have a very strange problem ... I have a big number of pages in a (non-modal) controller. There is one page which is accessible from 2 different pages. If I come from the one page - everything works fine. If I come from the other page - also first everything works but then ... if I click in that page (to reload it with different data) I get the following error: Warning: htmlspecialchars() expects parameter 1 to be string, array given in xxx\HTML\QickForm\element.php on line 215 Warning: htmlspecialchars() expects parameter 1 to be string, array given in xxx\HTML\QuickForm\element.php on line 221 Can someone please tell me where this error message comes from? I tried to play around and found out that in the place where PEAR expects a string and not an array - all the elements of the former page appear. I am very confused why this happens and would appreciate help very much! Daniel