No volume waveform generated - why?

Hi there,
in two of my backingtracks no volume waveform is shown in the player. Is it a bug or did I miss to activate the "generate / show waveform" function?

https://www.wikiloops.com/backingtrack-jam-229700.php
https://www.wikiloops.com/backingtrack-jam-230520.php

Any help appreciated.

Tnx,
VanGrean

Fixed it :) This happens sometimes - a small bug in the software.