Just a minor thing, but while I can comment out CSS using CTRL+/ from the Advanced Settings, I cannot do so (using the shortcut) while I'm in the app itself (i.e. "Custom CSS" section).
To be clear, I am referring to the following screen below. I would expect to be able to use CTRL + / to comment styles, but this doesn't work.
Interestingly enough, it does seem to work as expected in the "Preloaded JS".
Not sure if I correctly understand you Emozio, but you can comment in the CSS section but you have to do it manually with /* */ - maybe this is not what you mean but if it is I hope it helps 
Yes, I know, I was referring to the shortcut. Thanks for pointing that out, I will clarify my post.
Thanks for reporting this! And sharing the workaround for other folks running into this
I'll reach back out when our team is able to ship a fix