Seems there is a conflict between "astickypostorderer" and "category posts widget" (http://wordpress.org/extend/plugins/astickypostorderer/)
When Astickypostorderer is active, the category posts widget doesn't generate the links to the posts he's supposed to, though i can see the widget title. When i deactivate astickypostorderer, the widget works fine again.
Strange thing, problem occurs only on blog home page (index.php). No problem so far with categories templates, even when the posts are ordered in the category ...
Anyone has experiencing the same problem ?