That's the problem at its most fundamental level.

In our case, we had people creating new pages that some how got the original text into the new page, which isn't behavior I saw in my tests. Yet if I look at the initial page for these wiki pages, I can see that they started with the same text as the initial page, and I don't think the students or instructor copied text over into the new page.

In any case, the truncation does happen, and causes exactly the sort of havoc that Dean describes as the initial page gets divorced from subsequent versions.

Index: view.php
===================================================================
— view.php (revision 972)
+++ view.php (working copy)
@@ -375,7 +375,7 @@
$currenttab = '';
foreach ($tabs as $tab) {
$tabname = get_string("tab$tab", 'wiki');

• $row[] = new tabobject($tabname, $ewbase.'&page='.$tab.'/'.s($ewiki_id), $tabname);
  + $row[] = new tabobject($tabname, $ewbase.'&page='.$tab.'/'.s(urlencode($ewiki_id)), $tabname);
  if ($ewiki_action == "$tab" or in_array($page, $specialpages)) { $currenttab = $tabname; }