Created attachment 74764 [details] this shows and explains problems with text, but pictures are OK I think this bug, 60571, and 60446, if not others, were all the same. Iḿ only filling it "again" in order to include my sample file. I have presentations made with LO 3.6.5.2 and previous ones, and they don't work well now. Be it in windows 7 64bits or linux Debian 64, Wheezy, kernel 3.2.0-3-rt-amd64. It appears that the effects *do work with the pictures*, though. But, with text, they fail. I've noticed this: if I had, say, 5 [or N] paragraphs (all included in a single effect, as "intensify", which I use a lot), then the first 5 lines in the slide, using the same effect, work, but the others don't: they show up with the slide, and they remain until the next slide shows. See attached presentation, please. It tries to show and describe the problems at once.
The issue is fixed in the current version of LibreOffice 4.0.1.2.