It's not very often that you should reboot or run the post-upgrade command after installing an rpm.
Generally it follows:
1. Install rpm and follow any other instructions that might come with it (restarting a service such as apache etc).
2. If it uses a page in the server manager but shows up as "unkown" then you need to run /etc/e-smith/events/actions/navigation-conf (you will see a lot of text fly past but generally you can ignore this). This will sort this out.
3. If it still doesn't work then read any install instructions again and possibly try to install again (some times it just doesn't work the first time

)
4. If that still doesn't work then try the post-upgrade and reboot.
5. Still no luck, shout for help here!