Hello.
I just joined beta.
I have exactly the same problem when I run the editor in 1920x1080 resolution.
Editing area and the game in full screen are black.
I have to lower the resolution to 1600x900, and then the editor and testruns are working.
Mikko
Windows 8.1 64
Samsung 840 EVO SSD 120 GB 2.5" SATA3
Asus GTX770-DC2OC NVIDIA GeForce GTX770
Intel Core i7 4770K 3.5 GHz LGA1150
Kingston HyperX black 16 GB (2 x 8 GB) 1
Asus Z87M-Plus Intel Z87 LGA 1150 microA
mikko_ketonen( )hotmail.com