I couldn't give a link because the entire site dies when the plugin is activated. Or in my case, when it was upgraded.
I tried installing it fresh on a different site and then the same site, to see what was happening.
I finally got a citable error message; it's a plugin conflict with Page Excerpt:
Fatal error: Cannot redeclare pe_init() (previously declared in /public_html/wp-content/plugins/page-excerpt/pageExcerpt.php:15) in /public_html/wp-content/plugins/multi-column-tag-map/mctagmap.php on line 741
Good to know.