@stefko Another Firefox with uBlock Origin running, alongside NoScript. (On Linux.) I made it to page 2, then whenever I selected the option to agree and clicked Next I got the attached at the top of the same page instead. NoScript was set to allow "...univie.ac.at" (temporarily), so should not have been interfering. I also have various other addons, but nothing that should have affected it.

Anyway, I'm happy to answer questions if I ever am able to see them!