I too have problems with every MSC that uses Prophet. I almost never see any assignments for which I qualify. I just get a message saying that I don't qualify for any of the available assignments.
I just did my first shop for an MSC that uses Prophet but it's only because I emailed them and they emailed back a list of available evaluations for the area in which I was interested. They told me they hadn't heard about this problem before.
We need to email all the MSC's and let them know that Prophet sucks big time and they need to either get it fixed or switch to another system. They are losing a lot of potential evaluators by staying on that platform.