I am using the newest script as you can see from the first post second screenshot (2.7 on title).
Bug 1
The case is not handled. It is displaying an error instead of the usual "same name" warning:
Multiple layers for the "Layer Name" skin have the same name:"
Layer Name
Rename or use the [ignore] tag for the other layers.
So some user may not know whats going on when saw this happen.
Bug 2
Below is the video exporting to CS 6:
Note that I only renamed the script file to "_ Export to Spine" so I can find it easier but the script content is untouched in the test.
You can see from video that tree 1-3 is not exported in the 1st attempt.
After corrected the name, things back to normal in 2nd attempt.

Here is the video exporting to CS CC 2018:

The same problem occurs this time, missing files with layer named with dot.
Unlike the result I engaged before which still output the files without the extension (.png).
I guess it is due to different psd. This one is simplified just for testing as I don't want to wait 15 minutes in front of the screen.
Anyway, the behavior is still incorrect as CS6.
About not being able to use PC when exporting
You can see from the 1st video when PS writing files, it keep stealing focus from what I was doing. In this case, I was just looking at the export folder but that could be writing email, programming or any other task. You can see that PS keep popping up above my other application. When I click my window, PS gain the focus back each time it does something. This may not be an issue if user are dealing with small / simple PSD but for complex large PSD, the issue become headache.Thankfully, the solution is at the end of the first post.
P.S.
The gif video screen size is 1:1 captured but it maybe shrinked when viewing from forum. You can save the gif and view it with other image viewer like Faststone ImageViewer.
Update:
Beside missing files, there is an extra file (Pine Tree Mt.png) in the output folder.
For layers (Pine Tree Mt.E 1, Pine Tree Mt.E 2, Pine Tree Mt.E 3),
Pine Tree Mt.E 1.png
Pine Tree Mt.E 2.png
Pine Tree Mt.E 3.png
is missing and
Pine Tree Mt.png
is created.
It is obvious that the output name is truncated right at the dot position in the test.