It is expected that the Gallery tab is not available and/or shown until the Save All Changes button is clicked after uploading images, This is in order to allow the user to modify descriptions / ordering and have that saved, In addition to showing the user the full list of images which would be in the gallery (ie. not just those just uploaded).
The white screen you're seeing after clicking save all changes however is weird, as it should reload straight to the gallery page.. And does for many other users.
