I had similar problem with get_category_parents()
and it was solved by inserting this string:
$category = get_the_category();
$cat = $category[0]->cat_ID;
oh I found it, insert this
$category = get_the_category();
$cat = $category[0]->cat_ID;
i am having the same problem and it is caused by incompability of 2.7 and get_category_parents. any solution?
