I was facing the same issue, and can confirm this fixes it.I encountered the same black screen problem with the free version of Avast on Windows 10. To solve it, I selected the "repair" option of Avast from its uninstall menu. When the repair was complete - it took less than one minute -, I launched GameMaker Studio 2 and my project. Then I cleaned my project by going into the Build/Clean menu. Then I ran my project. At this moment Avast may ask you if you want to authorize GMS2 to run. Of course you do ! Now your project should run finely - well, depending on the quality of your code ! You may have to repeat all the repair Avast/clean GMS2 process later if the black screen ever come back. I had to do it twice, but now Avast seems to be at rest with GMS2.
"Repairing" Avast won't solve the issue, you need to let Igor.exe through ransomware protection.I actually have the same problem, use the same antivirus, and have followed the steps and it has not been fixed.
It's a blank default room, with an object with no events. The sprites were simply not appearing.Make your own topic and provide the room info that you're trying to have sprites/objects in