When admincentral starts-up with an app fragment specified (=> by default it displays some app instead of applauncher), the app theme is not applied right away.

The reason is that by the time the method which is supposed to set up style injection is invoked, the app view is already in the component hierarchy. The method unfortunately instructs the style to be attached when the app view attaches => it never happens (until app re-start), since app is already attached.

The solution would be to attach the stylesheet right away if the app view itself is attached and postpone it (like we do now) otherwise.