I think there may be a bug with wp_list_bookmarks when using the category_name parameter. There are no restrictions to category names for links as far a special characters, so if I have a category named "How to learn more?" and I try to pull those bookmarks by category name I don't seem to get any bookmarks returned:
<?php wp_list_bookmarks('categorize=0&title_li=More Resources&class=widget widget_text&category_name=How to learn more?'); ?>
Besides specifying another way of accessing the bookmarks like category ID, is there a way around this? I'm trying to pull bookmarks by category so I created post categories and bookmark categories to have the same name an then in the template pulled the bookmarks by category name of the current post category but I've run into this issue.