This bug was found whilst testing bug #538064

You will need to have the second revision of the patch
attached to that bug applied:
http://bugzilla.gnome.org/attachment.cgi?id=112919
Then rebuild and reinstall Orca.

Steps to reproduce

0. Start patched Orca.

1. Open the presentation at:
   http://bugzilla.gnome.org/attachment.cgi?id=112929&action=view

2. Page Down to slide 2

3. (Use the mouse to) change the layout to "Title, 2 Text Blocks". This is the
4th item in my list of layouts and looks like it has three placeholders: A
title and 2 bulleted lists.  Having done so, the original bulleted list will
occupy the left half and a new bulleted list will appear on the right half. 
The new placeholder will contain the text "click to add an outline".

4. Press F6 until you get back to the Normal page of the scroll pane.  For me
this is two presses.

5. Tab amongst the placeholders.

Results:  The first one is correctly read. The other two do not have
their contents read.

Expected Results: All three placeholders should be read correctly.

I looked into the bug. See the Orca debug log at:
http://bugzilla.gnome.org/attachment.cgi?id=112949&action=view

I added some debug statements to my new code and it's
clear that when focus is on one of those two lower place holders
(say ImpressOutliner3 at line 772) and we find it's the desired
accessible component hierarchy (at line 795), and we then go to
speak each of the children, we find that the child count is zero
(line 845).