[Plugin: Quick Post Widget] Duplicate Post with Some Other Plugins Enabled (Simple Face Book Connect

I’ve been using quickpostwidget in page mode. When some other plugins are used (including Simple Facebook Connect) I was finding duplicate posts were occurring.
I traced this to the other plugins calling apply_filter(‘the_content’… in the header section as well as in the body section.

The quickest fix I found was adding the in_the_loop() test to line 1273 of quick-post-widget.php i.e.:

if ($error == ‘no’&& in_the_loop()) {

This then corrects the functionality of the widget in page mode, meaning only one post is entered.

http://wordpress.org/extend/plugins/quick-post-widget/