Prematch screen loads blank with Friends/Notification Toolbar at bottom still showing

Joined an ARAM queue.

When match was found, application did not show prematch screen but instead was like a blank main screen except with the friends/notification toolbar on the bottom right still showing.

Application did not respond to clicks.

Attempted to shutdown and restart application... however, blocked from queue due to recent declined game.

Joined a new queue and it worked fine. Seems to be a one off thing.