Hello @jdeproost,
http://146.185.182.10/index.php/extwidget/preview/partner_id/102/uiconf_id/23448204/embed/auto?&flashvars%5BstreamerType%5D=auto&flashvars%5BplaylistAPI.kpl0Id%5D=0_wwm4yehd is no longer working so I cannot look into it any further, please provide an alt URL.
In general, I'd recommend upgrading to 12.5.0 which includes player version v2.50 before we continue troubleshooting, although v2.49 included in 12.4.0 should work as well.
You can find the changelog for 12.5.0 as well upgrade info, here: