Youtube and Vimeo embed not working

[Ingi]

Hæ, I've seen this problem posted before with no clear solution. Can't click OK after pasting a link for Youtube and Vimeo embeds. Can you please help me out?
Version: 2.5.6, ingikristjan.is

[mariusjopen]

Dear @Ingi
Do you have everything up-to-date?
Wordpress, Plugins, Laytheme?
Many wishes!
Marius

[Ingi]

Hæ Marius,
Yes, everything completely updated. No custom JS either.

[mariusjopen]

Dear @Ingi
Best is if you write me a PM and include your username, password to your Wordpress Admin panel and a link to this conversation.
Many wishes!
Marius