Problems with slideUp in Chrome

Problems with slideUp in Chrome

Hi,

after Domready some elements are added and modified to the site. After this i'm sliding up these elements with
    $(myParent).find('span.' + myClass).slideUp(1); // slow also doesn't work

this works fine in any browser (e.g. firefox, IE, etc.)... but not in Google Chrome.

if i call the object text with aller() it works fine in chrome also hide() works but not slideUp... after the element is done and i click a link that calls slideDown eg slideUp it works fine but not in the first call after creating the element.

hope you can help me... thanks...