App  isn't working correctly. How can I fix it? I have an application that isn't working correctly. Either it's not launching, or not responding to commands, or some of the functionality isn't doing what I expect.

What are some simple steps I can do to try to fix the issue on my own?

(This question and answer are intended to be a canonical and generic source for dealing with apps that aren't working quite right.)
The steps to take with an app that just isn't working properly are:


Rotate the device


if that doesn't help

From Settings | Applications | Manage applications | &lt;application&gt; or Settings | Apps | &lt;application&gt; (depends on your version of Android)


Force stop


if that doesn't help


Clear cache


if that doesn't help


Restart the device (turn off/turn on the device, or use the "restart" option if you have it)


if that doesn't help


Clear data


and if that still doesn't help, try the nuclear option:


uninstall and re-install