Just as a note, for systems with below minimum requirement graphics that were working prior to the pre-patch, one of our developers posted information regarding that here. In general, this is being worked on, but make sure to check the DirectX settings in the command line arguements.
If that doesn’t seem to fix the situation or you’re not sure, copy and paste the DxDiag text file created and paste it between two ~~~ like so:
~~~
DxDiag Here
~~~
If you have issues pasting here, use Pastebin and post the end of the link. (ie. 123456 for pastebin.com/123456)