There has been a long-standing bug in dispus with handling of directories containing thousands of files due to a command-line-too-long problem when passing the list of files to the du command. It’s now fixed by running it through xargs and using the IPC::Open2 library to run it, allowing me to pass the list of filenames in via standard input. If you have no /usr/bin/xargs on your system, it will fall back to the old method.
Enjoy the new version – it has been 7 years coming!