Peter Kenny wrote
> Hello
>
> This seems exactly like a problem I reported almost exactly a year ago -
> 15 July 2017. Peter Uhnak reported then that he saw it regularly. The only
> sure remedy we found is to reboot the machine - occasionally reboot twice.
> I am using Pharo 6.1 on Windows 10. Since that report, I have seen it very
> rarely. Most recently I found that the Pharo window appearance was
> distorted - wrong font size etc - but I did not see the debug console
> error message.
>
> Advice to Webwarrior - reboot machine and see if it goes away.
>
> HTH
>
> Peter Kenny
Rebooted, and the problem did go away.