Description of problem:
The following query works for Steven Whitehouse, but fails for me:

https://bugzilla.redhat.com/buglist.cgi?bug_status=NEW&bug_status=ASSIGNED&f1=blocked&f2=cf_conditional_nak&f3=cf_qe_conditional_nak&keywords=Extras%2C%20Tracking%2C%20SecurityTracking%2C%20&keywords_type=nowords&list_id=6355089&o1=substring&o2=isempty&o3=isempty&query_format=advanced&v1=69FileAndStorageRPL

The error message I get is:
  Can't use cf_conditional_nak as a field name.

Once I remove "&f2=cf_conditional_nak" from the query, I get:
  Can't use cf_qe_conditional_nak as a field name.

Once I remove "&f3=cf_qe_conditional_nak" as well, I do get a bug list, but likely not the same as with those parameters in place.  

Expected results:
I was expecting the original query to work.  Is this a permission problem?