I seem to have some problem bringing the old 1.26 server to the new beta version since the game simply ignores the graphics related settings in autoexec.cfg.   
The machine that I use is a headless server(so it has no independent graphics card) with core i7-4790, but without disabling the 3d rendering it frequently crashes while loading the map files and eats up lots of CPU usage(above 90%) while the server is running(with an empty mission and no client).    
The old autoexec.cfg method(as provided in graphics_readme.txt)   
 options.graphics.render3D = false   
does not seem to work in the 1.5 version as far as I can tell. I have seen other users reported the same problem of unable to disabling 3d rendering via autoexec.cig but I still can not find a solution yet.:(   
So I am wondering if there is an alternative way(s) to achieve this? Thanks!:helpsmilie: