When the editing pane has focus, the "selected" page in the thumbnails should be the one where the insertion point is sitting (unless there's a selection that crosses the page boundary). Currently, the Pages panel inexplicably selects TWO pages whenever the insertion point is placed on a page (when using spreads). This creates problems when the user is working on the right page, and performs certain actions like starting a new section.

Currently, that section will start on the wrong page; because the Pages pane has selected the left page as well as the right, the new section will start at the left page, instead of where the user actually invoked the command (on the right page).

Auto-selecting the one page where the user places the insertion point would not preclude anyone from clicking on multiple thumbnails in the Pages tab and performing actions as they do now. When the user clicks back in the editing area, the pages pane would return to highlighting the page containing the insertion point as the selected one. This behavior already exists, but it's just erroneous and absurdly inconsistent: If you select three page thumbnails, and then click back in the editing area, the selected page thumbnails will indeed change... oh, but only if you happen to click on a page outside of the selected collection. Otherwise, nothing happens.

And there's another problem, AKA another selection: There may be yet another selection highlight, on a parent page... which has nothing to do with either the editing pane or the page thumbnail that's also highlighted. That should never happen. With both child and parent pages shown as selected, what will the next user action apply to? He doesn't know.

In summary, it's a very simple fix: When the user places the insertion point on a page in the editor (or the editor regains focus), select that ONE page in the Pages pane.