The window manager divvy is a big part of my workflow. When restarting my macbook yesterday it failed to open entirely. It doesn't give any feedback as to why it's not opening. I tried deleting the app and reinstalling it(via the appstore) to no avail. Was wondering if there was some sort of way to diagnose and fix a stubborn application. I'm on el capitan v10.11.1.
It's a known problem since 11/10. Update only needs to be approved by Apple. Should be available tomorrow. In the meantime you can use the demo version of the website.
In the meantime, the developer recommends that you use the trail version.