When using custom rendering (client-side rendering using JSLink property on a field) to customize the appearance of the field in list views, the customization is only working with fully rendered pages. It is being completely ignored (without any change to work around it) if partial rendering is used as part of the new Minimal Download Strategy Feature, which is by default activated in all TeamSites. As soon as the user switches between views or navigates around, whereby the page is not fully re-rendered (but merely parts requested, indicated in the URL by the presence of the start.aspx#...), the customizations vanish and the raw-content of the field is rendered as part of the base-type rendering.
This is a critical bug, effectively preventing the use of CSR.