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I'm trying to sideload an application, as seen in the picture below.

I have allowed the installation of applications from unknown applied actions in settings, but I can't seem to press the install button. The cancel button works correctly and installing applications via adb install works correctly. What's the problem?

EDIT: For those who have this problem, using ChainFire's C.F. Lumen will correct it because the app uses hardware compositing, and Android doesn't notice a "layer" on top of the current screen.

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Looking at your screenshot, I think you are using screen filtering apps like Twilight, f.lux, CF.lumen and bluelight filter. Try to force stop/uninstall/disable the screen filtering app and it will work again.

If you are not using any filtering app, try looking for your installed apps that have overlay capability, apps that can show their contents over another apps, apps with overlay permission (like- Messenger, Musixmatch, Touch Assistant apps that can float on your screen).

If you are not sure, try disable them one by one in your Settings ⇒ Apps and find which one is causing the problem. You can also look for "Draw over other apps" menu in your android setting where all the apps with this permission will be listed. If you couldn't locate the menu, search for overlay permission + {android version} + {device manufacturer}.

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    It worked. But why is this a problem? – user24200 May 26 '14 at 13:40
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    I believe Android disabled it for the security reasons. The malicious apps might trick the user to install unwanted apps by showing something over "Install" label? – Min Naing Oo May 26 '14 at 16:11
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    Can you tell why screen filtering app causes this issue ? Because Cancel button is working and install button alone not working .. – logan Feb 13 '15 at 8:40
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    Thanks - pausing the Twilight blue light filter app on my Samsung Galaxy S5 solved it for me! – Adam Spiers Dec 6 '15 at 11:25
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    @TeoInke Then that battery saver+fast charging enabler+antivirus+ram cleaner+all the bloatware available in universe app will show something like 'oh your phone seems pretty slow. why not press ok button below' over your message :P – Min Naing Oo Jun 10 '16 at 3:17