If it's anything like my experience it's luck of the draw on the proctor and their "interpretation" of things. I used the same room and setup for every exam with them. Second to last one, the proctor said my room was 100% unacceptable. I protested and was told that there was no way this very same room ever was considered acceptable. So I moved into a new space and finally moved on to the test. My last exam with them? Used the old room and had no issues.