my chrome extension is already updated to the new one from today and works fine again so try uninstalling/installing the extension again and it should install from the updated source at google
... and some good news is that in my case the regular chrome extension was already updated into v.56 published today and works as expected in regular way. Thank you for quick reaction and fix. 馃檹
Have same issues with "Relume: Syncing Classes..." freeze today - never experienced before - tried on Chrome and Arch via extension and directly from webpage - same everywhere.