Hi Floris,
Let me apologize in advance if I've misunderstood this...
While WordPress index (home) page will call the number of posts set in Dashboard > Settings > Reading, it may be overridden by a static homepage. These will not have posts on them unless you use a plugin like Special Recent Posts. However, if you create a page called blog, news or anything you desire, you may set that to be the blog page in the lower of the two drop downs at the Reading settings page.
This will automatically pull the same number of posts as a default homepage. However, no matter what template you apply, it will still show as using the Blog template. The reason for this is that PageLines is applying the Special Page template to allow the blog posts to be formatted cleanly and without interference. If you want to add things like sliders, boxes, etc, you may apply them to the Blog template in Drag & Drop.
You may read more about static
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and
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. A blank page will invariably result when the blog page isn't set up correctly or if the incorrect sections are added or subtracted in the template.