I fixed it on my Mac by completely trashing my install (including deleting all the caches / pref files etc) – basically zapped the entire Chrome folder.
Clean install, and all working.
Yes; I read about that. The problem is that there is no clear reason why that should fix it, and it doesn’t fix it for everybody by any means.
You lose all passwords, etc, no? And if the installation is synced to other Chrome installations they will get trashed also.
This crazy solution should not be necessary, even if it works.
It’s been fixed just now 
Took google a fair while – for all their resources.
