LinkedIn - Job search page

Do you have to pay to get a job listed on the LinkedIn job search page?

I applied to a job listed on it last week but when I looked at the search page today it was gone. That's not a problem but if you do a search for the company the only hit is the job ad.

The company themselves do not have a LinkedIn page.

So I was just wondering what happened.

Also have other people found it, the job search section, to be fairly unstable? I have in the past noticed that when you change your industry sector selections the page may end up resulting in no ads i.e. I select the manufacturing box and get a listing, then I deselect it and select the medical box and get a listing, then I deselect that and reselect the manufacturing box and get no listings