I've been having a good time with VideoScribe (VS), with several videos with no problem. Then one scribe would not render, and it kept going for a couple days. When I contacted VS, they managed to get it going, though not on the normal platform. But they also kept working on it, and after a couple days, found that there was a single corrupt element that I'd inserted, and that messed up the whole thing. And they identified what element it was. Once I knew that, I could replace that element, and all went well. But I was impressed that they took the time to track down what turned out to be a fairly subtle element that crashed the whole thing. This, I've found, is pretty typical of their customer service.