There's indeed something fishy with yomgui's videos, but hard to tell if it's vimeo's fault or webkit. The direct link owb attempts to play really points to the video and can be downloaded, though (see message log window).

> hard to tell if it's vimeo's fault or webkit.

Seems it wasn't Vimeo's fault, right?

"Fixed an issue with some vimeo links that prevented videos from being played."
http://fabportnawak.free.fr/owb/owb-morphos-1.13.readme

Anyway, thanks for fixing the issue in OWB 1.13 :-)

In some video links (not all of them) the HTMLMediaElement can't get the page frame object, which is needed to retrieve the user-agent (amongst other things). And without proper user-agent, the media download fails.

And this could be a webkit bug, actually.