see summary

h4. Steps to Reproduce
1. Start MP > open Tetris > start a new game
2. now build a tower so that you have 4 lines free space on top
3. now wait until a green object (4x1) is available (other objects move to the left and right side), when it is after releasing it from the top you have immediately to press up and rotate it
4. now mp plays the 'sound' again and again and does not set the game over

h4. Additional Information
http://forum.team-mediaportal.com/tetris_does_not_recognise_game_over-t13158.html
In forum Thread you can find screenies, a logfile and a video "How to reproduce"

confirmed by Koudijs