Hi again! solved it! Here's the instructions I found.......
navigate to your game's Options menu, click Advanced and choose Direct3D 9 (shader) from the "Graphics API" drop-down. Note that this option is recommended for all Windows 8.x/10 users to achieve the best performance. It will also let you use the Steam Overlay, so enable it if you haven't already.

Hi, is anyone else having problems starting a match on steam? everything ok until click to start match then get Fatal Error message........ ERRORLOG.TXT file. Any help would be very much appreciated!