Sorry for the late reply, I finally got around to do what you suggested: uninstal NW.js and "reset" the manifest files.
I also uninstalled and reinstalled C2. Just in case I deleted 3rd party plugins and behaviors too.
To be clear, I tested with r247, NW.js 0.26 downloaded from Scirra's page and win7/10 64bit on desktop PC.
I still got the same result. I did that with both win7 and 10 again.
Did "manually uninstall NW.js" mean:
Control Panel, Programs, Programs and Features, select NW.js and click uninstall?
That's what I did and if that's not what you meant, could you tell me how to manually uninstall NW.js?
Also I was wondering if you could upload your capx and exported file like I did last time so that
I could try them out. Sorry for keeping bothering you.
If anybody tries the test and share what you get here, I'd appreciate it.