I’m using Scrivnener Beta 1 for Windows (7), and I like it much. But . . . when I attempt to include an additional paragraph mark (i.e. empty paragraph) between two paragraphs’ worth of text, then copy and paste into another program, the additional paragraph marks do not carry over.
This sort of thing has been noted and will be solved in a future beta and/or by the time of official release. 
8)