In LW4 I am losing the grid and the loaded file when I connect

In LW4 I am losing the grid and the loaded file when I connect the K40 .It’s just a white screen in the Grid area If I have generated the Gfile I can run the job but can’t track the laser.
Any ideas. I’ve reloaded the program several times and deleted the LW appdata folder each time before reinstalling.
I can prepare a file. Position and set speed and power. Generate a G file. When I connect the laser to my computer the screen goes blank but I can still run the job. Any help?

Disappearing grid is related to no or poor WebGL support of the computer in use.

I ran an on line WebGL test and got a positive message. So I have webGL capability, how do i check the level of support?

@bbowley2 ​ does you computer have a dedicated gpu ( video card ) or is it integrated. Some computers will pass WebGL but cannot keep up . LaserWeb need a good video card