Nice plugin indeed. However with version 3.8 it doesn't work any more for me. On different installations with different themes I am getting a page loading failure and this message:
Warning: require_once(/.../wp-content/plugins/category-coloumn/includes/A5_field-functions.php) [function.require-once]: failed to open stream: No such file or directory in /.../wp-content/plugins/category-coloumn/category_column.php on line 40
The path defined in line 40
if (!function_exists('a5_textarea')) require_once CC_PATH.'includes/A5_field-functions.php';) in fact doesn't exist.
Does anyone have a fix for this?