Program is open at your screen. If you press Cmd-H, window is hide and you can get it back easily.
If you click red cross at left upper corner of window, program stays open (and do it's bidding at background), but you cannot get program window back to your screen!
Only way (at this point to get window back to the screen) is select program from task-list and then "Quit" and re-open it from you Applications.

This is a known bug, will be fixed for sure.