I recently upgraded to 1.3.9b as well as the patches. However this problem was happening even before the upgrade.

Anyhow, I can't update or edit items such as the shipping/payment modules. I can install it, but it won't update when I make changes. It just takes me back to the main admin page. I have no idea what I need to correct in order to get it to work. So when I add anything from API login to my shipping Table rate, it won't update with my corrections.

Any thoughts or help?