I've a strange bug. When i want to refresh info about a file already in my list (...add info from file), the lenght and the duration double. Every time Movie Catalog "sum" the duration and lenght value to the old values.
It is not a bug it is a feature. That allows to import info from files that are on two CDs for example (as you cannot import info from the two files at the same time).
But in the future I will probably add an option to clear these fields before import.