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Fixed in 4.5.3



Found in


Issue ID




"Run in Background" does not work for fullscreen

Graphics - General


To reproduce:
1. Open attached project
2. Go to player settings. Make sure "Run In Background" is enabled
3. Include the test scene and build&run
4. Select full screen. You'll notice a counter that goes up
5. Alt-tab and wait for a minute or two. Return to the game - the timer wasn't increasing in the background

Regression since Version 4.2.2f1

Note: This is specific to Direct3D 9. Enabling Direct3D 11 in the player settings will work around the issue. There will be a patch release for 4.5 with a fix shortly (

Comments (32)

  1. 8d74fc9b0c39d4e9ee0a6701e50aacff?d=mm


    Apr 03, 2015 05:46

    I'm having this issue in Unity 5.0.0f4

  2. 755ed41a94643c8be0c492f5518db763?d=mm

    hamza kambouch

    Sep 14, 2014 16:18


  3. 998a2eae11fae36af066f5d63f50f36d?d=mm


    Aug 15, 2014 03:34

    @GC67: I'm using 4.5.3p1 and am not noticing that.

  4. 67ee2612d2d66bb29079e41c0d075c90?d=mm


    Aug 02, 2014 19:46

    This is "fixed" as of 4.5.2p2 but now the Unity game window won't give up focus when u alt-tab or try to switch to another application. Anybody else noticing this? I feel like they fixed the background bug by not letting the app go into the background...

  5. 871ab527de69e3372df744f5239e15af?d=mm


    Jul 24, 2014 05:32


    Dave Hampson:
    I had a chat with Kaspar one of our graphics programmers, and we hope to have it fixed in 4.5.3

  6. 998a2eae11fae36af066f5d63f50f36d?d=mm


    Jul 22, 2014 02:24

    Alright, this is ridiculous. Fuck Unity. I'm going to use UE4.

  7. A91571baba19241471fffc732bade24e?d=mm


    Jul 11, 2014 05:20

    I just realized this says Severity: 2.. I'm not sure what the scale is for this.. But it seems like this should be WAY higher than 2!

    This is literally destroying every online game ever. There may as well not be networking capability with Unity if this bug isn't fixed.

  8. 2d7e59969ffe19d6c30d6f8ce6999ed5?d=mm


    Jul 10, 2014 09:47

    Can you give us any estimate when this bug will be fixed, This is game breaker for any networked game. Is there any way (paid support ?) to increase priority for it ? Are there any "work arounds' which can be done on the application site (ex. via native plugin) which will prevent application from pausing in the background ? Any Ideas ?

  9. E803058ed996c51f526c58fa1d4cb8ca?d=mm


    Jul 08, 2014 19:45

    Hey everyone check out this page: I've just been using an old version that doesn't have this bug for the time being.

  10. 871ab527de69e3372df744f5239e15af?d=mm


    Jul 03, 2014 07:20

    Crap :\
    Thats a game breaker for me
    Lucky I was able to find out thats a bug before buying pro (was about to buy it at the beginning of august)

    Is it confirmed that its fixed in Unity5 at least?
    I have no idea what to do now :\

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