# KbDemo not working, Mac OSX Catalina

**URL:** <https://psychtoolbox.discourse.group/t/kbdemo-not-working-mac-osx-catalina/3042>\
**Category:** Bugs & Features\
**Tags:** macos\
**Created:** [February 13, 2020, 4:26pm UTC](https://psychtoolbox.discourse.group/t/kbdemo-not-working-mac-osx-catalina/3042 "2020-02-13T16:26:18Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![gabrielino00](https://yyz2.discourse-cdn.com/free1/user_avatar/psychtoolbox.discourse.group/gabrielino00/32/26_2.png) [@gabrielino00](https://psychtoolbox.discourse.group/u/gabrielino00)\
**Post date:** [March 26, 2020, 9:26am UTC](https://psychtoolbox.discourse.group/t/kbdemo-not-working-mac-osx-catalina/3042/10 "2020-03-26T09:26:50Z")

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> [@gabrielino00](#):
>
> > Apart from hw differences, it could be the Catalina version (possible) or Matlab version (unlikely). As PTB’s keyboard handling is independent of Matlab (execpt for GetChar), Matlab is not likely to cause such a specific problem. But Apples trainwrecks have different bugs in each release, so maybe it is the difference between 10.15.1 and 10.15.3.`
> 
> At the moment I am not able to force the update to Catalina 10.15.3 and to test this hypothesis.

update:  
We have installed the last Catalina update 10.15.4 and now Kbdemo is working well.  
Probably there is something wrong in Catalina 10.15.3.

thanks for the assistance

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