Created attachment 54217 [details]
sample document

See the attached fly.odp with a text box with three 1st level paragraphs (Foo, Bar, Baz) with one 2nd level paragraph each (First, Second, Third), with an on-click animation (fly in) grouped "By 2nd level paragraphs" (see context menu of any of the items in the "Tasks" pane's "Custom Animation - Effect Fly In" list, "Effect Options... - Text Animation - Group text").

When doing the slide show, the individual 1st and 2nd level paragraphs correctly fly in one by one (Foo; First; Bar; Second; Baz; Third).

Now, remove the effect for each of the 1st level paragraphs (Foo, Bar, Baz), via the items' context menu "Remove".  When doing the slide show, the first 1st level paragraph (Foo) is correctly displayed right from the start, and the individual 2nd level paragraphs correctly fly in one by one (First; Second; Third), but the remaining two 1st level paragraphs (Bar, Baz) are erroneously not displayed at all.

Also, after removing all the 1st level paragraphs' effects, the grouping of the remaining 2nd level paragraphs (as stated at "Effect Options... - Text Animation -Group Text") changes from "By 2nd level paragraphs" to "All paragraphs at once".  Manually changing the setting for a paragraph does not work, after closing the "Effect Options" dialog it automatically goes back to "All paragraph at once."

(Reproduced with a libreoffice-3-4 build towards LO 3.4.5.  On master towards LO 3.5, this cannot currently be tested well, as doing this animated slide show, at least in an unxlngx6 --enable-dbgutil build, soffice.bin aborts with drawshapesubsetting.cxx's makeTreeNode calculating std::distance between singular iterator and end; immediate problem appears to be that maActionClassVector.begin() == maActionClassVector.end() in DrawShapeSubsetting::getTreeNode.)