Old queries store email searches in assigned_to= and reporter= format. When
loading in a stored query, the new query.cgi does not place the information
anymore, but if you run the stored query directly it works fine because
buglist.cgi converts into assigned_to and reporter format anyway. The new
format is email1=, emailtype1=, and emailassigned_to1=.

Two solutions would be either hack query.cgi to do the conversion from old
style into the new for displaying and making some sort of note for the user
to reupdate their query, or make a script to update the database and change
all occurances of the old to the new for everyone.

The last would be the best way since the code needs to stay as close as
possible to the main mozilla bugzilla source.