Millisecond Forums

Hi all,
Am hoping for some advice about video issues for an online Inquisit task. I've chosen mp4 as it is apparently the most common video format to be played by browsers. The video embedded in the task works perfectly with Inquisit 6 on all local computers (PCs and Macs) that I have tested. However, on those some computers, the video will not play in the Online Web Player version of the task (am getting errors about it being invalid media, failed to load source). Any advice? Screen shot of the error attached.


Thank you