A few observations on 1.3.10.
I used lower case characters in ending and pausing GCode scripts. m104 resulted in "invalid gcode"
Changing to upper case solved it.
No total layer information in GCode Viewer. Can get it by running the pointer up to maximum, but it would be better where it was before.
I like to preheat both hotend and bed. It used to show me both temperatures on the graph and in the Terminal view. Now it does that, but only until I hit the Print button, when it still shows the bed graph and temperature in the terminal view, but it stops reporting the hotend temperature. The hotend is still heating, and as soon as the bed gets to temperature, the hotend temperature is shown immediately.
I don't really need an answer. I just wanted to point these things out, and I am not sure where to report issues with a release.