Typescript Problem with Generics and File Watcher

It seems that the Typescript plugin can't handle the new Typescript generic syntax.

Example:

var x : Array<String>;

Gives a red square in Intellij 12.1.4.

But the code works.

And it seems as if the Typescript file watcher plugin only works on every second save.

BTW: I'm on MAC OS X 10.8.4

Regards
  Roger