johndyer/mediaelement — comment on commit 5a3f20498b4725fd65da96e968a699b4e81d5ab2
File: src/js/mep-feature-volume.js line 22
By porsager:

If the volumeslider is inside a hidden element, this will create an endless loop in jQuery 1.3.2 and newer. (of course the user can try to avoid it being in a hidden element, but there is no way to know when positionVolumeHandle is called).
I would like to look at a fix, but currently i haven't got the time.