Alex Harui commented on FLEX-35376:

Focus management in an AIR app with more than one window is a complex thing and 
there could certainly be bugs in there.  If you can build a small example with 
two TextInputs in multiple windows and find steps that reliably cause problems 
that would help.  Could it cause the app to crash?  Maybe, depending on what is 
going on when the FocusManager gets confused.

> Desktop application created for Windows is crashing unexpectedly
> ----------------------------------------------------------------
>                 Key: FLEX-35376
>                 URL: https://issues.apache.org/jira/browse/FLEX-35376
>             Project: Apache Flex
>          Issue Type: Bug
>    Affects Versions: Apache Flex 4.16.0
>         Environment: Windows 10
>            Reporter: Jed Hatamosa
>            Priority: Major
>         Attachments: details.png, event viewer-1.png, event viewer-1.png, 
> event viewer-1.png, event viewer.png, exe has stopped working.png, my 
> machine.png, runtime error.png
> We have an air application that supports multiple instances (can run multiple 
> windows app). Recently we are experiencing a crashing issue (Please see 
> attached file). When trying to test in other OS like Windows 10 pro, its 
> working fine. But for some like Windows 10 Home it will crash. I have also 
> tested running the app in Mac OS and it is working fine. 
> We can replicate the issue if we are going to run multiple instances of the 
> app, then we login on both instances, then do some parallel transactions on 
> both instances until we get the error at some point. 
> We have also tried running in debug mode but I cannot replicate any null 
> exception issue and it will just show the not responding issue. SO it's 
> really hard right now to pin point where the issue is and what is causing the 
> issue. Maybe you can help us give some more info on where and why this is 
> happening. Is this a system issue? IS this something in the code ?

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