Video tag not working in tabs in IE9 and Crome controls transparent

Hi,

there is something i can’t figure out. In IE9 the video in the second tab is not showing. Also the poster from the first one is disappearing.

In FX, Opera, Chrome, Safari it works.

And in Chrome i have the funny thing that the controls don’t have the grey background-color.

http://fitness-rodgau.de/nieder-roden/zumba