An App stopped working since El Capitan

• If you have a favorite app that is no longer functioning on the newest version of Yosemite or is so slow that you can’t even use it anymore you can usually restore functionality with a few simple steps. Check in the App Store to see if that app has any recent updates to improve its relations with El Capitan. This will be shown via App Store updates, and you can choose to update all apps at once if necessary. When finished, go to the Apple Menu and select Restart to reboot your computer and see if the app works again.

• You can also check to see if your app is using any plugins or extensions (looking at you, Safari and Mail). For most apps, like Safari, you can go to the Menu button, select Preferences, and click Extensions if the app uses extensions. This will bring up a list of Extensions that can be checked on or off. Try disabling all of them and see if that improves matters, then narrow it down to the exact plugins that are causing the problem. Try this with any Apple app is giving you trouble.

• Try deleting the app completely, then re-downloading it again from the App Store. Sometimes this can help solve bugs and other issues.