Nav-bar trouble since latest update

When I refresh a page (I’m using tabs and nav-bar) a non-styled, untitled nav-bar appears while the correct nav-bar is loading or hidden.

This issue seems to have started since the latest ionic update. (Is there a way to check this?)

Other issues that seem to be related, but might not be, include my content bleeding into the status bar when a nav-bar is hidden, but a header exists, and the has-header class is no longer recognized in the ion-content tag, but works when I include the class in a container div for the content within ion-content.

Thanks for any insight.