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Flicker of Editor Widgets in ViewPort

UE 4.12.4 With Realtime Render on for the viewport, the Editor GUI Widget such as the tri-axis tool or even the collision box around an actor flickers. This goes away if realtime render is turned off. This was not happening with 4.12.3. Video: https://youtu.be/KLRzvyKUwPI. Yes I have rebooted after the update was installed.

Mac OS X 10.11.5 Model Name: MacBook Pro Model Identifier: MacBookPro11,3 Processor Name: Intel Core i7 Processor Speed: 2.8 GHz Number of Processors: 1 Total Number of Cores: 4 L2 Cache (per Core): 256 KB L3 Cache: 6 MB Memory: 16 GB

Chipset Model: NVIDIA GeForce GT 750M Type: GPU Bus: PCIe PCIe Lane Width: x8 VRAM (Total): 2048 MB Vendor: NVIDIA (0x10de) Device ID: 0x0fe9 Revision ID: 0x00a2 ROM Revision: 3776 gMux Version: 4.0.8 [3.2.8] Displays: Color LCD: Display Type: Retina LCD Resolution: 2880 x 1800 Retina Retina: Yes Pixel Depth: 32-Bit Color (ARGB8888) Main Display: Yes Mirror: Off Online: Yes Built-In: Yes

Product Version: UE 4.12
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asked Jun 29 '16 at 10:46 PM in Bug Reports

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avatar image Steve Hardister ♦♦ STAFF Jun 30 '16 at 06:33 PM

Hi skcalanerson,

We have a bug in for this active since UE4.11 (UE-27525) reporting flickering, but only if the nVidea Card is inactive and the Intel card active... Can you verify that the nVidea Card is active when you are experiencing this bug?'

You can set this by opening Energy Saver and, at the top, uncheck Automatic Graphic Switching which will leave your nVidea Card open at all times. (You can switch back after testing.) It is expected this will resolve the flickering -In which case, this is the same bug that has already been reported.

Set graphics performance on MacBook Pro

-Let me know if this temporarily resolves the issue.


Steve H.

avatar image skcalanderson Jul 01 '16 at 12:50 AM

This was already disabled and it makes no difference with it on or off.

avatar image Steve Hardister ♦♦ STAFF Jul 11 '16 at 02:34 PM

The machine I'm testing this on is slightly lower spec than yours and I am not seeing the same behavior so I requested our Hardware team test this on a machine with the same hardware as yours and they, too, were not able to reproduce this behavior.

Please describe the exact conditions in which this is occurring. ie. If this occurs in a blank project, which template are you testing with. What are your preview rendering settings? Do you have any special Editor settings? etc. Is this still occurring in UE4.12.5?

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Hi skcalanerson,

Since we have not heard back from you in a few days we are closing this post for tracking purposes. However, if you are still experiencing flickering with widgets in the editor viewport, please respond with the requested information and we will continue to investigate.


Steve H.

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answered Jul 18 '16 at 07:12 PM

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Hello! I am experiencing the exact same thing. Especially the outline of a selected geometry flickers in most places - that is the blue or green lines are flickering. My project is a fresh install of 4.17, with a ground and a geometry box and sphere.

The flickering goes away when: - I switch from additive to subtractive. - When i press a menu, like the settings, play or launch-drop down menus in the top of the viewport.

Did a fresh install of video drivers, dont really understand the issue. I have a Gtx 970, i5, UE is on an SSD, Windows 10.

Please halp!!

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answered Aug 23 '17 at 10:18 AM

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avatar image KlarkFromDDark Aug 23 '17 at 10:20 AM

Also, there's no flickering when in unlit or wireframe mode. Tried rebuilding lighting as well.

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