You shouldn't put a promising program like this on the net if it has such crucial failures.
This program doesn't have "crucial failures" that I know of. I'm sorry you had problems, but you shouldn't react like that. I can assure you that this program isn't a scam. Far from it ! We have lots of very satisfied users.
now I can't find the list of movies I own anymore.
I don't know (yet) what has happened to your data, but there's very little chance that it's completely lost. Because the program automatically creates backups for you (yes, we take your data that seriously).
To begin with, let's make sure that you're not doing something wrong: when you click "Owned Videos" (between "Movie Encyclopedia" and "Existing Videos"), does it really say that you don't own any video at all ?
If that's the case, then please click the help menu and select "locate my coollection file".
What's the size of the file "MyCoollection.cool" ?
And how many automatic backups are there inside the folder "Backups" ?