I think there's a minor bug in SER. Here's how it happens: I paint multiple projects and import urls (I have tested with site lists). SER might say it imported 10 million urls or something.
However, when I hit start, only a couple of the projects really kick it off, while around half just go nowhere. I then looked at the "show remaining target urls", and it said 0.
Could you check this one in more detail?