Hello,
I created a new script as a first tryout and for later personal use. The script only contains two lines and works so far. I also filled out the script's properties, but it is not visble inside the scripts list.
In the script properties there is a "Get info" option that can be set to true if the site is made for getting info from a web site. Only these appear in Movie -> get info -> from script. All scripts are visible in Tools -> Scripting, so you should be able to find your script from there.