Why doesn't tap-clicking work often in Flash? In a few situations in Flash, tapping to click doesn't work, while mechanically clicking does. (Tap-clicking is of course turned on.) It's in some cases a Flash game, and in some cases Hulu or another video site. Why doesn't tapping work, and why does clicking work?

My guess is that it has something to do with whatever the Flash equivalent is of "mouse down" versus "mouse clicked."
It's probably about that Flash object's design/development.

I haven't used Flash for development in a long time, but it must have attributes for allowing/disallowing such things. And since every developer behaves differently you are experiencing different things like that.