Seems like eZ Webin Toolbar rules are invalid. The default rule:

all modules 	all functions 	No limitations

does not validate as valid to use the toolbar. Adding the following rule solves the issue:

websitetoolbar 	use 	No limitations

The affected file is extension/ezwebin/design/ezwebin/templates/parts/website_toolbar.tpl where this not return true with the default policies for admin role:

$website_toolbar_access = fetch( 'user', 'has_access_to', hash( 'module', 'websitetoolbar', 'function', 'use' ) )

Steps to reproduce

1. Do a fresh install of eZ Publish 4.1 with eZ Webin
2. Login to the website
3. Editor toolbar not visible
4. Add a policy:

websitetoolbar 	use 	No limitations

5. Editor toolbar now visible