Crash when alt+tab

Development Platform & Builds
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1

Test users reported a crash when alt tabing with the following error screen:
http://prntscr.com/angeti

any ideias on how to fix it? seems like an engine issue…

2

Hi sonicphi,

To clarify, are saying that users that are testing your stand alone game that you packaged from the UE4.7 version of the engine are experiencing this issue? If so, have does your project contain coding the allows users to tab through menu options? Have you opening a copy and packaging from a later version of the Engine?

Also, please include as much detailed information as possible regarding this issue? (ie, What type of machine was the game created on, Mac or PC -include specs- What kind of machine are the end users testing on, etc.)

Thanks,

.

3

I have not done any code that messes with alt tabing, i haven’t touched those keys at all, the game was packaged in a win 8 64 bits and im not sure what machine the user was running it on.

All i know was that it was 64 bits and windows and should be a fairly good machine since it runs most recent games.

The crash seems to be happening when alt tabing for a long time or alt tabing many time in sucession.

Hope this helps.

4

Hi sonicphi,

In regards to my question about tabbing through menus, this does not refer to alt-tabbing which universally allows the user to tab between applications in Windows. Rather, some games allow a user to press a button (often “tab”) to switch between menu buttons and “enter” to make the selection. Just thought there may be a conflict there if this was the case with your game.

That said, the issue with the game crashing when the user presses alt tab is most likely not an issue with the engine itself, but a problem asset in your project. This could include an error with a Blueprint, code, plugin conflict with Windows, etc.

To isolate this, please post the following logs from your project:

Game Logs

This log will be generated while running a Cooked/Packaged Project (ProjectName.exe or ProjectName.app) Always include this if there is an issue with running the packaged game.

Game Log:

  • ProjectName.log WindowsNoEditor/ProjectName/Saved/Logs

Build/Cook/Package Logs

  • Cook.txt P4 - Engine\Programs\AutomationTool\Saved\Logs
  • UAT_Log.txt Binary - C:\Users\UserName\AppData\Roaming\Unreal Engine\AutomationTool\Logs\
5

link text

There you go the log, right at the end, seems to be something to do with resolution…

6

Thanks for supplying the game log. Would it be possible to also get a copy of the packaged game and/or project files? If so, you can send them to me as a dropbox link (or similar) via Private Message on our .

7

Hi sonicphi,

Thanks for supplying the packaged game for testing. So far we have not been able to reproduce the issue on systems running Windows 7, Windows 8 and Windows 10. Also, in your message you mentioned that you, also, were not able to reproduce the issue on a Windows 7 machine.

This would point to the conflict being with the specific Windows 8 machine you are testing on more so than with UE4. That said, we would be interested in what the conflict is in order to see if there is a fix that could be applied to UE4 to make it more compatible across platforms, if possible.

If you wish to continue investigating the cause, we will need the following:

  1. The DXdiag from the machine that is experiencing the crash
  2. What type of browser the tester is alt + tabbing between
  3. At what point in the game (and/or how long into the game) does the crash consistently occur

Thanks,

.

8

link text

He was alt tabing between team speak in the video, but according to the tester it doesn’t matter what he is alt tabbing between it always happens. He was using mozzila at the time.

Crash happens anywhere in the game, time inside the application also doesn’t seem to make a difference.

9

Hi sonicphi,

Looking at the dxdiag we see that the machine you are testing on has an integrated graphics card instead of a dedicated GPU. This is most likely the cause of the crash and not a problem with the Editor. If that machine (or similar) is the target platform, you will need to take measures to optimize the graphics for machines with lower graphics capabilities.

Please try optimizing your graphics or testing on a higher end machine and see if this is not the case.

Thanks,

.