Geogebra Classic 6 will not open/start
I have Geogebra Classic 6 version 6.0.496 on my Mac OS High Sierra version 10.13.6. When I open the app (that i downloaded from App Store), the app name shows up in the left corner of the screen (which it usually does when all apps or browsers are open), but no window.
The name in the left corner of the screen indicates that Geogebra has been opened, but there is no window.
I have tried restarting my mac, deleting and reinstalling the app from App Store, and I also tried downloading the portable version, but none of them will open.