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Some headlines are slow to take hold. In most case they show up 24 hours after inclusion into your headlines module. I recommend setting the casce to or updates to hourly untill you get them showing up and then go back to what ever time fram you want.
Also, be care of what headlines you have on your start page, slow loading headline feed will make your site look unreachable untill the feed has loaded, this include feeds in a block on your main page.
I've since limited what I display on my homepage feeds and just keep a bunch in the headlines section of the site to minimise the impact of a troublesome feed.
Also, (yes theres more) if for some reason a feed just goes poof, wait a day or two and it will come back. IT's not your fault, it;s the feed source doing som funkiness that I don't understand