show_admin_bar(false) no longer working

Starting today (or maybe yesterday), my logged in non-admin users started seeing the WordPress Admin Bar.

I have in my theme’s functions.php: show_admin_bar(false);

So I just installed the plugin: Hide Admin Bar Toolbar
and set it to not display the toolbar – but I’m still seeing the admin toolbar. Arrgh.

NOTE: I am NOT seeing it for an ADMIN user when on a page of the website, but if I login as a “Subscriber”, then the bar shows.

Suggestions as to why this would change on it’s own and how I can get rid of the wordpress admin toolbar?

Thanks,
Coleen