Xcode 12.2 on Big Sur: Crashing when opening Behaviors pane

Question

Created Nov ’20

Replies 31

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Views 9.2k

Participants 30

After upgrading to Big Sur and Xcode 12.2, the app crashes every time I select the behaviors preference pane.

I can see the following error in the crash report:

Code Block ProductBuildVersion: 12B45b
Crashing on exception: The window has been marked as needing another Layout Window pass, but it has already had more Layout Window passes than there are views in the window. 
<NSPanel: 0x7f9a85f69130> 0x9ed (2541) {{545, 363}, {830, 552}} Behaviors en

Anyone else experiencing this?

Answer 1

Sharra OP

Feb ’21

Same behaviour here.
Xcode 12.4
macbook pro m1
Big sur 11.2.1

open preferences on either external monitor (no they aren't hooked up at the same time) Crashes Xcode both with and without a project open. Move xcode to laptop screen - preferences does not crash the application and everything works fine.

Answer 2

CPSoftware OP

Feb ’21

I think I found the answer. Unplug all iOS devices from your computer. Since I've done that, no problems.

Answer 3

rafalkopiec OP

Mar ’21

Hey,
I found a solution but it's not ideal, but enough for me.
In Mission Control, uncheck "Displays have separate spaces". This seems to work fine. Then to disable the fact that all other screens go black when pressing the green fullscreen button, use this app called "RightZoom" to reroute that button to be used just for the old-style stretching window to fit the screen. Haven't experienced any issues with Xcode since then. Otherwise, with "Displays have separate spaces" enabled, XCode crashes for me every time i open preferences, and also at random points it freezes every 10 mins or so. Works with latest XCode version as of 26/03/2021.

edit:
using MBP 13 from 2018, no touchbar

Answer 4

BSMandel OP

Mar ’21

I have had this issue for a while now.
I submitted feedback to Apple.
Within a few days I got a reply that it should the fixed in Xcode 12.5 beta. I checked, and it's indeed fixed.
Hopefully it will stay like that for now.

Answer 5

JWeissmuller OP

Apr ’21

Same exact problem. How is that this is still an issue 4 months later? Do you really expect developers to not use external monitors? Get with it Apple....

Answer 6

BSMandel OP

Jun ’21

This bug has been fixed in Xcode 12.5.