Originally Posted by jtf2-phalanx
So, I've sent a message to the person and he's not responding at all. Would I be considered out of line by leaving at least a neutral feedback or negative feedback since it doesn't look like he's willing to get in contact with CP anymore?
Give him an ultimatum (a week) to respond. If he doesn't respond by then, then the negative feedback would be well deserved. Don't bother with the neutral since there is definitely fault here.
Just a caveat though, leaving any negative feedback will probably cease any resolution or communication from him. Honestly though, if a problem like this takes months to resolve (just to get $100), I wouldn't count on getting any compensation from him.
What's his username? Maybe an admin could help out?