This is probably a simple fix but I can't seem to figure it out. When I upgraded from MU to WP 3 Multisite, I also switched from MuTags plugin to Global Site Tags. The tags display on the tag page but when I click on a tag to show the posts assigned to that tag, I get a 404 Page not found error. I am using WP 3.2.1 with Post Indexer 2.1 and Global Site Tags 2.1.2. I have tried updating the posts, clearing the wp_site_posts and wp_term_counts tables, updating the permalinks, deactivating and reactivating the plugins, and nothing seems to be working. Please help.