Hi, I'm working on a site that a developer converted to WordPress by modifying the Twenty Eleven directly. The version of WordPress is 3.3.2, and I'm trying to update the version so that I can use certain plugins, but I can't get the update to work without the whole site blowing up.
So I tried creating a child theme of the customized Twenty Eleven theme following the instructions on creating child themes from the Codex as best as I could. I created a new folder under Themes with the name twentyeleven-child, I copied the customized style.css, pasted in the new directory, and modified the theme name to 'Twenty Eleven Child' and the template to 'twentyeleven'. I then copied all of the other files from the customized parent twentyeleven folder to my twentyeleven-child folder, except for functions.php. I activated my child theme and it worked fine (when functions.php was copied to the child folder, it didn't work). I then downloaded the most recent version of twentyeleven, and copied the files into the parent twentyeleven folder. Now the layout of the site is all messed up.
What do I need to do to create a child theme that is a copy of the custom parent theme, and be able to update WordPress? Is there a certain subset of files that I need to copy over to the child theme directory?
Thanks for you help.