Hello I have 4 k2 items and I have linked them to my menu when I click on these items the content is there be it isn't using any template or any css what going on.
www.ourfuture.org.uk 

click on bobota

First, create a new item, with nothing but test in the description, assign it to a new category called test with all default settings. Link it to a menu, and prove that your template works when the menu item is selected.
If that works, assume that something is "breaking" the template while loading.
Take the video out of the item. If using an override for the category set it to default.
Please report back what the issue was if you find it

Hi I have tried this but the same thing happens I have tried changing templates with no luck I could reinstall the k2 component and try it all again.