Theme Problem – Visual Editor Broken (Posts Only)

I have a theme which seemed to be working fine with the latest update of wordpress but now the visual editor does not appear when trying to edit a post. The text within the body of the editor appears to be white because I can view the text when selecting it. Page editing works fine. I have limited the issue to the theme because switching to twenty-eleven removed the issue. I have deactivated all plugins. I have also tried to install “Use google libraries” plugin based on another post. I’m at a loss and need some help. Thanks in advance!!!