Can confirm this bug is 174+ related. I just exported my game which was working fine on 172 & 173 and now touch/mouse clicks don't register properly, AND there's a beeping audio bug which I've never had before. On Macbook Air 2013.
I also tried to copy over the older version node-webkit folder in html5 export in C2, overriding the current version and now the game doesn't load at all, crash on start. The older version is from either 171 or 172 (which work fine on export before).
Trying again with 173...
Seriously such a crippling bug like this, how the hell did it made it pass QA from the NW team and Scirra?
Edit: Copying the note-webkit from v173 to override C2 v175 doesn't work either. Crash on startup. Game over.