I'm using the latest version. 7.1.831.
I don't really know what your meaning with: "a one second to what is already there.".
If I just press ctrl+enter I do see a page break marker, if I insert a table of contents (which uses font style toc1), I don't see a page break marker, but the lines with style toc1 does bump to the next page.
Also if I select the toc1-styled line, disable the "Paragraph | Page break before"- option and then enable the same option, you can see the style behave properly (as in staying on the same page when PBB = inactive or bumping to the next when PBB = active).
I added some screendumps for you to check it out.
This is the normal pagebreak

Here you see that PBB is active when selecting the toc1 style and checking the Paragraph properties.

But when I edit the toc1 style...

You can see the PBB property is suddenly inactive...

And this is what I see when inserting a table of contents with a toc1 style in it... No PB marker like with ctrl+enter.
