This has happened at least twice: the latest list of problems says I've skipped one. I've never skipped a problem.

A skipped problem may occur when you experience an interruption in your internet connection while attempting a Tactics Trainer problem. If your internet connection is not stable enough while in the Tactics Trainer you can consider switching to the unrated training mode so that you will not be penalized for this.

You can go to http://www.chess.com/tactics/settings.html to change your Tactics Trainer settings.

we *think* we have found a fix for this :) should come in the next few weeks.

That would be nice mate! By the way u won because of bad defensive skills when it counted and could have been prevented by solid positional play designed to stop ur attacking idea's in its tracks. But u do show how u have to understand tactics to prevent them in the first place.