1. FID should be in hex, with no leading 0x or anything like that. Just the same as the FID file's name.
2. I'm not sure why it's silently dying. I have debug prints if any of the hijack ioctl()'s return errors. However there are probably other places where it could die without warning, I will look into that. So far I have an odd scenario where a majority of people are telling me it works fine, but two people (yourself and Bruno) saying it silently dies. So there definitely is a problem.

I am insanely busy moving into a new apartment right now but the next version will definitely have more trace prints to try to see where this problem is. EmpWake is my #1 priority right now, with the lyrics, trivia game, and text-to-speech stuff way in the background... So I think you can expect an instrumented Empwake in the next week.