mplayer osx

hi. i have used mplayer osx since i bought my ibook in february. a few weeks ago, i was deleting apps i didnt need, and i must have deleted it. so i downloaded it again, but it isnt as good as the previous one i had. i cant use apple+2 or apple+f to control the screen size. and to change it to full screen, i have to go to the program window, change to full screen, and then go back to the video window. does anybody know what is going on?

what do you need Mplayer to play? i used to have that app and started to clean out stuff and found that all you need is quicktime(with divix installed) and windows media player.