There are many times due to adding various actions that I will accidentally do something (like adding an additional wrap wrongly) that will cause havoc on my sidebar where my sidebar will appear below my content. What happens is that the #sidebar is now subordinate to #content instead of them appearing together in #content-sidebar-wrap (or whatever). So I have found a simple solution for this when this happens. I move my sidebar up.
I simply add this to my functions.php file:
[php]
remove_action('genesis_sidebar','genesis_do_sidebar');
add_action('genesis_before_content', 'genesis_do_sidebar');[/php]
Yes, I recognize that this is only a bandaid, but...