Could you try any of the above launch options in steam to see if it fixes these problems?
Also, could you send through a file located inside the Gems of War Data Folder called output_log.txt?
To get to the file, in Steam, Go to the library and Right Click on Gems of War. Select Properties > Local Files > Browse Local Files…
This should open up a new window. From here, open the GemsOfWar_Data folder, and the output_log.txt is located here.
Sending us this file will help us track down what is causing your issue!