at the prev version the nwjs looked like this
but this version looks like this 
I have no idea why it would be any different from before. oO I ported the version to Mac the same way as always.
Can other people confirm if this happens or doesn't happen to others with the Mac version as well?
Else my best suggestion would be to wait for the next update and hope it'll fix the issue.
I have no Mac myself, so I know very little about the system and can't test on it.
Sorry about the trouble.