Another difference from M3 to M4 I can't seem to figure out if there's a way to replicate it.
On M3 when you scrolled thru the gcode the toolpath used to highlight the move segment in the toolpath. I can't find anyway to make M4 do that. I'm going to keep trying to find it but any help on whether it's possible would be appreciated.
Thanks again.

OK I found it looks like it is highlighting the current segment. But the color is so close to the line color it's hard to see.
I tried to change the colors in the screen editor but it doesn't seem to change in the window.
Am I missing something?

I finally found the answer to this one also.
I was changing the line width from 1 to 2 and it didn't change - barely see the line.
I saw someone said be generous so I set it at 30 and no change. After all night trying things I went all the way to 300 and now it shows up like a line should. Wow, generous really means a lot.
Thanks for the fourm help.

This has EVERYTHING to do with your video GPU and its associated Windows driver.  If I entered 300 on my machine, the whole tool path window would be filled with a line segment.    Newer video cards and OpenGL drivers are not properly supporting the OpenGL function called glLineWidth(), which is what that tool path setting is using.  So I'm glad you found a setting that worked for you because some GPUs don't even allow the line width to be changed now! 

Steve