When a client starts completely ignoring your calls and emails, they're either (A) having serious money/personnel problems; (B) thinking/hoping you will forget that they clearly owe you money for work contracted, executed, and approved; (C) planning to not publish what you've written; or (D) some combination of all.
This kind of thing doesn't often happen. But when it does, I always wonder why people don't just buck up and say what's going on. The results will be the same in the end — why not be professional? Why not use common courtesy?
I think it's SO much easier to communicate. But some days, apparently, that is just me.