Yes, I was asked to retake. They mentioned that my photo ID was 'a little blurry' but it wasn't a big issue (they understand that webcams can be potato-quality so as long as it's 'reasonably' clear and in focus, it should be fine). The main reason was, as mentioned earlier, that the little box that shows yourself while taking the test did not (in my case it was a camera icon with a red slash through it, indicating that the camera wasn't on (even though the light on my webcam was on the entire time, which is another thing
).
I'd say give it a week and if the test hasn't flipped to 'Completed' by then, call in. It usually takes about 4 - 5 days for someone to validate and mark it as Completed.