Version 1.6 of Serial Port JSON Server now published. Has end-of-file fix and new Grbl buffer by Jarret Luft.
One small annoying thing about this upgrade is the widget will tell me to upgrade but there is no link. 
Fiddling a while by jumping to different workspace eventually get me a link to click on to download :-).
The GRBL workspace works well for sending gcode but the axe widget is not sync nor is the visualization of where the tool is. @Jarret_Luft , is this a bug with the current implementation or is it an unimplemented feature?
Its likely the inches vs mm issue. Grbl reports position as mm or inches based on a global setting, not based on your Gcode file. Jarret and I are working together to find a solution. New support for inches was just released like an hour ago in the 3D viewer if you reload ChiliPeppr. You’ll see “in” or “mm” now in your extents labels.
How do I run the grbl buffer in 1.6? I simply start the serial json server then run http://chilipeppr.com/grbl.
Hmm, let me give that a try.