On previous themes I had used Social Dropdown plug-in. It works fine with the theme.
Then, I was reading about Sociable and decided to deactivate Social Dropdown and install Sociable.
Now whenever I deactivate Social Dropdown, I get this error:
Fatal error: Call to undefined function Show_Dropdown() in /home/xxxxxxx/public_html/wp-content/themes/atahualpa/functions.php(388) : eval()'d code on line 17
and the sidebar disappears
I don't see this code in the functions.php file.
This error is gone when I reactivate the plug-in.