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"Save Preferences" Button frozen till you move the Preferences window a bit
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Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.48

Blender Version
Broken: version: 2.90 (sub 0), branch: master, commit date: 2020-05-01 14:06, hash: rB60741cfe181c
Worked: (newest version of Blender that worked as expected)

Short description of error
When I go to preferences and click on any toggle, like "emulate 3 button mouse", I'm not able to press save preferences for a few seconds, like the UI froze for some reason. This doesn't happen all the time, but can be reproduced reliably by closing and reopening the window/blender instance.
In the video, I'm repeatedly clicking on the save preferences but the UI is frozen for a duration until it unfreezes and highlights on hover.
(UPDATE: Turns out this is very localized to the "Save Preferences" button, but this means you can't save any changes till you move the window, which is super weird.)


Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]

  1. Go to preferences
  2. Try clicking on Save Preferences.
  3. If the button isn't being highlighted, try moving the preferences window a bit and then check again.

Event Timeline

Ruthwik (ruthwikrao) updated the task description. (Show Details)
Ruthwik (ruthwikrao) added a comment.EditedMay 2 2020, 10:40 PM

I think I found the epicenter of this issue. There's a super weird thing happening where the preferences window remains frozen when you open it until you click and move the window, then it suddenly unfreezes and everything works fine. I tested this by closing and restarting blender several times and doing it right after it launches and got the same result every time.
Here's a video showing the issue.

This comment was removed by Ruthwik (ruthwikrao).
Ruthwik (ruthwikrao) renamed this task from UI freezes for a duration after toggling options in preferences. to UI freezes for a duration after performing a toggle action..May 2 2020, 10:50 PM
Ruthwik (ruthwikrao) updated the task description. (Show Details)
Ruthwik (ruthwikrao) renamed this task from UI freezes for a duration after performing a toggle action. to UI freezes for a duration after performing a toggle action in Preferences..May 2 2020, 11:20 PM
Ruthwik (ruthwikrao) updated the task description. (Show Details)
Ruthwik (ruthwikrao) renamed this task from UI freezes for a duration after performing a toggle action in Preferences. to "Save Preferences" Button frozen till you move the Preferences window a bit.May 2 2020, 11:43 PM
Ruthwik (ruthwikrao) updated the task description. (Show Details)