I have SubMux version 2.23 and I'm trying to use it to add .ssa subtitles to an xvid .avi. I open it, drag the avi and ssa to the window, press mux, select where to save the new video, then some options come up (I don't know what they're about), I just press ok and it makes the new video in a matter of 2 seconds. when I open the new video it's just 1 second of blackness. shouldn't it be the old movie now with the subtitles in place? what am I doing wrong? or do I need a different version? I'm using windows xp if that makes a difference.