As the FAQ says.... One question per thread please
I can't answer (1). Like you, I couldn't find the Location field. However, (2) can be achieved quickly by...
[ol][li]Exit Opus completely[/li][li]Open Windows File Explorer and navigate (on Windows 7) to %appdata%\Roaming\GPSoftware[/li][li]Rename the Directory Opus folder[/li][li]Restart Opus[/li][/ol]
This will create a new configuration from scratch. It's a good idea to save a "vanilla" configuration that you can revert to for testing.
Regards, AB