Probably because of the {sync: false} in the button scripts, try with {script: false} using version 1.13.0-beta (link in the forum).
First of all : i love the new editor 
really nice and pleasant to use !
Second : i don't know what {script: false} really does... but... Thank you so so.... so so... sooooooooo much !
At first I kept having trouble... well... stupid ones... cause i had double set of images, in two panels (just because the first button needs 4 images)... The shift buttons showed/hided the panels those images were in. I don't know what was wrong there. But having just 2 images per button, and 4 for the first one and all this images in only one panel... makes it.
This morning, i did it the easy way : one switch, 4 buttons plus a Shift... 5 minutes and all was ok.
But this "morphing" way brought me a lot : console.log... stateGet / stateSet... locals. ... and many other things...
Thanks a lot for all the support, @jean-emmanuel. Just incredible 