Hello,
I'm using Xion 1.0b127 portable, and it appears that if I pause while playing, and then close Xion... When I open it back up, it will not resume where it left off (the seek indicator is at the beginning). If I now click play, it will start at the beginning of the track. I checked Settings.dat and it did correctly save the LastPlayPosition and LastPlayState="paused" when closed.
I also noticed that if I close Xion while the track is playing... when I open Xion again, the resume function works correctly.
I'm running Windows XP SP3.