Initializing Asset Discovery Lockup?

Hi, for some reason - out of the blue - my UE project won’t fully open. It opens a few windows (Layers, Blueprints, Content Browser) but not the main editor window. The content browser is greyed out and has an ‘Initializing Asset Discovery’ progress bar at the bottom which appears frozen. I’m not getting any hits on this, any ideas?

In case anyone else ever hits this:

  1. Deleted intermediate folder & re-opened, and it did the same thing.

  2. Closed and re-opened via commandline adding -log argument, it opened and opens normally now via launcher / explorer