WordPress won't communicate with actual blog.

Dear all,

I have found myself lost in troubles.

We resently launched a new website with the blog attached to it.
The problem is that if i write a post and publish it it does not show up on the actuall blogg.
It shows as published on the dashboard, if I press preview it shows but if I go into the actuall website it’s not there.

I have updated evertything, deactivated all plugins, cleared cookies, tried different browsers but nothing works.

It’s like the dashboard and the actual blog isn’t talking to each other.

My friend however claim that when I logged in (using the same login as me just on a different computer) he could not see the post in the dashboard.

Any suggestions on what to do?
I’m lost.