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When I hit the render viewport shading, it keep displaying the normal viewport. At the beginning of my project it worked perfectly but I stopped using the dual viewport, when I came to use it the second time, somehow it didn't work. Maybe I touched something I shouldn't?

Footage of my problem

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    $\begingroup$ Try "Ctrl+Alt+B"... just in case you have accidentally defined a render border $\endgroup$ – lemon Jun 16 '16 at 18:06
  • $\begingroup$ Are you using CPU or GPU compute? What is your graphics card and system specs? Maybe it's a GPU or driver issue. $\endgroup$ – Duarte Farrajota Ramos Jun 16 '16 at 18:13
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    $\begingroup$ This little dot here below the axis is probably a render border i.gyazo.com/a9994f4c3788857b7a7318c13aadbd65.png $\endgroup$ – lemon Jun 16 '16 at 18:16
  • $\begingroup$ @lemon you are probably right, looks like a very small render border making it look as if viewport render is not working at all. $\endgroup$ – Duarte Farrajota Ramos Jun 16 '16 at 18:44
  • $\begingroup$ it may be affecting the light in the scene. do you have an environment on stage? $\endgroup$ – Utok Jun 28 '18 at 7:18
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You may have paused the viewport rendering. Check if the 'pause' button in the viewport menu/header is pressed.

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    $\begingroup$ Even if it was paused it wouldn't show the viewport, it would show a checkerboard image. $\endgroup$ – Ray Mairlot Apr 6 '17 at 13:32
  • $\begingroup$ For me, that was totally it. It rendered everything but it just looked like there were no materials nor lights. Thank you! $\endgroup$ – Elias Feb 29 at 21:24
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I had the same problem a few days back. You must've accidentally set the render border too small to be visible hence it appears not to be rendering.

You can clear the render border by pressing CTRL+ALT+B or you can do it manually by going to the View>View Borders>Clear Render Border

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