Ok, a couple of useful tips for new users:
1) Please check your installation logs, including, but not limited to tomcat for possible installation/runtime errors.
2) If the install/runtime logs don't highlight any underlying issues, then try looking at the Server Configuration Tool to see if all the ports are allocated correctly.
3) The Server Configuration Tool has a 'Reload' button which will fix some issues, but not all.
4) Keep your install directories at there default locations to save yourself any more headaches!
5) MagicInfo is at best buggy code, so look for simple errors to resolve recurring issues.
6) If you system is working, leave it well alone unless you really need to patch it!