From the article:
When we went to our seats, the wait staff let us know that despite the fact that the previews were playing, we wouldn’t know until the movie actually started whether we could see the film or not. If it didn’t work, the screen would just turn black. Luckily, the film went through without a hitch.
I worked as a projectionist in 2009 when the cinema got its first digital projector in order to be able to show Avatar in 3D. At the start of the movie no one actually knew if it would work. Due to the movie being encrypted - with every cinema in Germany waiting eagerly for the password - No cinema was able to play the movie. But everywhere cinemas were packed with people. Because of fuckups somewhere in this incredibly stupid system the movie was delayed about half an hour (IIRC) nationwide. With no-one knowing if it would eventually work - especially nice for the people working at the cinema having to deal with angry audience members.
At the same time the 2D 35mm film-version we also had started without any problems (it was massive and pretty dicey to carry it around).