Get "play" button on timebar again

[Mozitux]

Hello, following an update, the play button has disappeared from the timeline at the bottom left of the videos and I can't find the variable to reactivate it. What setting should I change?

Thanks!

[mgogoulos]

There has been a major upgrade after you posted this. If you can update the installation, you will get the latest version, what way do you use for updates?