links to categories in admin page broken?

When clicking the link "view" or the # of sites in a category from the admin page we get a page not found error. (see screenshot) For example the "view" link points to: http://commons.trincoll.edu/blog/bcat/admissions/ and if i click the number of sites I get this link which also does not work: http://commons.trincoll.edu/sites-by-category/&category_name=admissions

but if I go through the category listing page this link works: http://commons.trincoll.edu/sites-by-category/?category=admissions

any ideas how we can fix this?