Load a track for the first time and Live performs the normal analysis. When it is complete it resizes the waveform leaving a large blank gap at the end. If you delete the track and load again, the blank gap in the waveform display is gone.
If you zoom in on the track whilst the analysis is happening this does not occur.
Blank gap at end of audio after initial analysis
Blank gap at end of audio after initial analysis
MacBook Pro 13" Early 2011 - OS X 10.7.4