Since (I guess) LibreOffice 2.5 it's possible that for effects on text, each paragraph of a single text object gets its own animation settings and and own entry in the tree of the animations (I mean the UI control box).
The default seems now to be that you get all paragraphs separated with own effect settings, i.e. the "All paragraphs at once" setting.....
When I change this to "As one object" in the Effect Options, the created effect just vanishes and therefore this can't be used.
 btw: shouldn't that read better something like "Each paragraph separately"
*** This bug has been marked as a duplicate of bug 48553 ***