Checksum - 1.5

When I first downloaded and used this utility it was great, but for some reason when I try and use it now I can't get it to open files. If I try and drop an application file onto the window it just won't accept it, and if I try and use the file dialog approach the Open button stays greyed out when I have a package selected - the only time it isn't greyed out is when you have navigated into a package and have a final element selected (such as info.plist). I think there is an issue with the way that the file opening is set up in the application so that it doesn't see packages as valid files to be selected. Shame, as this was great - elegantly straightforward and simple - when I did get it to work.