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UE4 on OSX freezes after changing user

The UE4 editor, on a macbook with more than one account configured, freezes the rendering of the viewport if you change mac user and come back to the user with the editor open after a few minutes. Plus, even if the UE4 editor is not visible, it keeps rendering at full speed (the fan of the laptop keeps spinning) The editor itself is not blocked, you can for example access menus. If you try to move the content of the viewport the window does not get updated (you have to quit the editor and start again) The behaviour that I would expect is that UE4 stops rendering every time the window is not visible (or at least thet it doesn't hang) All versions up to 4.4.1 are currently affected. Please let me know if you need more details to replicate the problem.

Macbook pro mid 2012 15 inch (OSX 10.9.4) Processor 2,6 GHz Intel Core i7 Memory 8 GB 1600 MHz DDR3 Graphics Card: NVIDIA GeForce GT 650M with 1GB of GDDR5 memory

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asked Sep 05 '14 at 02:08 PM in Bug Reports

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avatar image Ben Halliday STAFF Sep 05 '14 at 10:35 PM

Hey devel.bmad,

I'm not certain I understand the process you're following. Are you changing users on the OS, or through the Launcher? If you're changing users on the OS, it should shut the editor down before switching. If you're using the Launcher, changing users shouldn't cause any issues with the currently open Editor. Can you describe the process more specifically so I can try to reproduce the issue? Thanks!

avatar image devel.bmad Sep 05 '14 at 11:57 PM

Hi Ben, I'm changing user on the OS, not the launcher.

On OS X if you change user with the fast user switching (click on the username in the right part of the desktop topbar) the current session is not terminated, and all the applications are put in background.

As I said, when in background UE4 keeps rendering full speed, while it would be better if it could pause itself.

Coming back to the user with the UE4 editor open in a very short amount of time doesn't freeze the viewport. Coming back afert 5 minutes or so always freezes the viewport.

If you drag and unmaximize the viewport, or if you go fullscreen, it unfreezes itself. Otherwise, it takes input anyway (e.g. if I move the current point of view and save, it will be in the new location at next startup), but doesn't update the display.

Hope this makes sense to you, if not please tell me. I'm at disposition for any other detail. Thanks!

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Hey devel.bmad,

Thanks for the specific instructions! I was able to reproduce exactly what you're seeing after switching back to the user with UE4 running, and have entered a bug report (TTP# 346028) for our developers to look over.

There is an option to lower the CPU usage while the editor is in the background which may help your secondary issue. Under Editor Preferences > General > Miscellaneous, enable Use Less CPU when in Background. I noticed a second bug while testing this with fast switching users in which it will continue its high CPU usage if it was in focus when switched from the first user (TTP# 346038), but putting focus on any other app on the second user account will lower it as expected.

Thanks for the bug report! I hope the information about Use Less CPU helps some, and in the meantime please minimize/maximize the editor if this happens to get back to normal functionality.

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answered Sep 08 '14 at 08:15 PM

avatar image devel.bmad Sep 08 '14 at 09:20 PM

Thank you Ben! Tried the option you mention, it is really effective for the high CPU usage when switching user!

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