Running WP in multi-site mode on my laptop's WAMP server. (http://localhost.localdomain/)
When I activate Assignment Desk, this error starts popping up on any URL:
Fatal error: Call to a member function add_rewrite_tag() on a non-object in C:\wamp\www\wp-includes\taxonomy.php on line 289
Tried installing older versions, but got the same result. I didn't get this error when I installed the very first "0.1" release, though.
Other plugins have the same problem; seems to be a WP 3.0 compatibility issue?