From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows 98; Win 9x 4.90; H010818)

Description of problem:
redhat-menu lists the following categories (see /etc/xdg/menus/applications.menu):
Utility
Development
Education
Game
Graphics
Network
AudioVideo
Office
System
and the generic "Application" which is put to "Other"... if that works, which it doesn't (at least for me) for qucs (and IMHO "Other" is not a good category to put things into anyway).

qucs.desktop in Fedora CVS lists the following categories:
Categories=Application;Electronics;Engineering;
which doesn't match redhat-menus.

Version-Release number of selected component (if applicable):
qucs-0.0.7-7.fc4

How reproducible:
Always

Steps to Reproduce:
1. Compare the sets of categories listed in redhat-menus and (fedora-)qucs.desktop.  

Actual Results:  The intersection contains only "Application".

Expected Results:  The intersection should contain a non-trivial entry.

Additional info:

Other Math/Science stuff seems to go into "Education" lately, maybe you should follow that trend? Otherwise, well, "Office" or "Utility". I don't really care where it gets put as long as it goes somewhere, you as the maintainer will have to decide.