I seem to have the same problem as a couple of others who have posted recently. The ad codes I place in widgets work perfectly, but any that I try to show using the "assign to position" checkboxes just don't show, not even at load priority 1. I'm checking the page with Firebug to see whether they are there at all but they aren't.
The affected website is http://raisingmischief.com and current settings are Ad1 in footer widget, Ad2 in sidebar widget and Ad3 "After Paragraph 2 or to End of Post if fewer paragraphs are found." There is nothing wrong with the Ad3 ad code because interchanging the ad codes between positions the same problem persists.
Thank you for your help.