Another club with a 100 per cent record hosted Marseille, who had yet to take a point.
In Switzerland, play at Thun had to wait because of smoke that settled across the pitch.
Hoffenheim produced their first significant attack, described as a good one, as the German side pressed.
Play later resumed at Thun, with about four minutes of smoke-related stoppage time due before half-time.
Officials judged there was no way anyone could play in that amount of smoke.
Crystal Palace faced Hoffenheim and Sparta Prague hosted Bournemouth among the ties.
Football was eventually under way at all eight of those early fixtures.
Europa League matches across eight early kick-offs got under way after 5.45pm GMT following delays that included a minute’s silence.