The sort feature does not always work on the Mac app version.
Sometimes it lets me sort by priority or date and sometime when I click on my choice it does nothing.
Seems to be a bug. Please fix and advise.
We've released a new version of our Mac app with bug fixes and new features such as quick task adding. Please install the latest version from http://todoist.com/mac and let us know if it fixes any issues you've been experiencing with the old version.