Tekniko not sure it is actually possible to test out of the box with nw.js without a license (I could be wrong about that), with nw.js being a standalone chrome, if said issues affects all browsers on this machine it can be expected than nw.js will also have the same one. (Plus the fact he did not precised that nw.js was his target platform, if the issue occurs for its customers too, well, that is quite important.)
PS: I should really find a way to not repeat nw.js every 3 words.
The thing is, this won't have an affect on his player base. We know he is using premade templates, so it's nothing he has personally done. There is obviously an issue with his setup. For now, I would just use NW.