Ok, I'm still having issues. I updated the NW.JS, but when I open the folder based project it just freezes and does nothing. If I open the project as a single file it opens no worries (this is what previously tricked me into thinking all is ok.) This isn't the case with all folder projects, I tried a different one. I removed the only third party effect I had and still the same. In the console I see just one error:
main.js:252 Error while parsing the 'sandbox' attribute: 'allow-storage-access-by-user-activation' is an invalid sandbox flag.
...which as I read elswhere is supposedly harmeless.
ANy idea what could possibly be the issue, as going to single file is troublesome Thanks and cheers.