Comment 2 for bug 1518253

with build 184 installed as an upgrade, then deleting the file whose presence switches from Welcome mode to normal mode [1], I don't see a blank screen either.

[1] ~/.local/share/unity-scopes/unconfined/com.canonical.scopes.photos_photos/hints_is_hidden

So have not yet reproduced, although I have not tried a fresh wipe install yet.