Currently some notifications that are created by an ajax request are not being shown at the right moment, just after a page reload. This is happening when we use some forms inside modals (e.g DOI plugins settings management). 

We didn't ported the js SiteHandler yet, but that's the SiteHandler that handles the notify event if no other in place notification controller is present, and that's the exactly case when you save the DOI settings form inside a modal.

I am not sure if this is the only reason for this problem and the only issue of the notifications system inside OJS, but as soon as we port the Site Handler we can check any others.