Ciao Carlo, sorry. I add some information about Pharo 1-4 on Mac OS X 10.14.6 ( Mojave ).
As far as I know there was an issue with the older VM's on Mac OS X where the graphics subsystem changed, causing that blank/black screen.
You will probably be able to use a different VM and make it work.
Excuse my ignorance but I have no experience in this regard.
I've got some older Pharo 1.2.2 images and either CogMT.3390.app (Squeak Cog 4.0.3390) or maybe even one of the other mac vm's from around that time will work.
Where i can download a valid mac vm's ? And where should i put it ? The Pharo-1.4 on my system have a: Contents folder and CogVM.exe ( the relative info are: type: Microsoft Windows application date: 22/6/2012 size: 2MB ) and some other files: FT2Plugin.dll libfreetype-6.dll Pharo-1.4-one-click.bat Pharo-1.4-one-click.sh SueakFFIPrims.dll README.txt Thanks, Dario