Hi jamestouleron, As alchymyth said a link to your site would be useful. But I’ll take a completely blind guess as to the problem.
I’m guessing you already have at least three AdSense ad units on the page which load before the sidebar. That is the maximum that Google allow (check their policies for full details). Therefore Google have stopped serving adverts to your page by the time the sidebar loads.
There is a bit more detail in one of the FAQ questions on my plugin page.
If my blind guess is correct you will need to think of how many adverts you want in each area so that you comply with Google’s rules. You can for example use AdSense link units as well as the ad units.