Hi Marty, I had the same issue, you need to run that script to readjust shared 
memory size again.  Somehow that gets erased with the OS upgrade.

73, Bill-AK5X-just a user not a developer..

> On Nov 19, 2020, at 1:21 PM, Marty Wayne <[email protected]> wrote:
> 
> Sirs;
> 
> First, thank you for  wonderful app for digital communications.  Your efforts 
> are greatly appreciated.
> 
> I just updated my MacBook Pro operating system to macOS Big Sur, V 11.0.1.  
> Since the upgrade the OS, I have not been able to launch WSJTx.  I get the 
> following errors:
> 
> Shared memory Error followed by Fatal error.
> 
> What might the issue be?  I am pretty much software illiterate so wont be 
> able to provide much else.
> 
> The WSJTx App is V 2.2.2.  Thanks.
> 
> Marty, W6NEV
> _ . .   .   . _ _   _ . . . .   _ .   .   . . . _
> [email protected] <mailto:[email protected]>
> 408-234-8023
> <Screen Shot 2020-11-19 at 7.57.41 AM.png><Screen Shot 2020-11-19 at 7.58.01 
> AM.png>
> <Screen Shot 2020-11-19 at 11.20.29 AM.png>
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