After upgrading from a previous version (kdepim-4.8.5-4.fc16.x86_64) with an existing task list the edit history dialog shows the tasks but the task name is empty. The new version is not listed (kdepim-4.9.2) but the code matches git master

Reproducible: Always

Steps to Reproduce:
1. Have a ktimetracker.ics from a previous version
2. Add some times to the history
3. Open the Edit History dialog from the menu (File/Edit History...)
Actual Results:  
The task list will show up but the task name will be empty

Expected Results:  
The task name field should have the corresponding task name from the main window

I do not see a way to attach a file to the bug, but here is the patch that fixed this for me:
--- kdepim-4.9.2/ktimetracker/historydialog.cpp.missing-names   2012-10-23 16:38:36.938774896 -0400
+++ kdepim-4.9.2/ktimetracker/historydialog.cpp 2012-10-23 16:38:43.222781901 -0400
@@ -113,7 +113,7 @@
         if ( !(*i)->relatedTo().isEmpty() ) // maybe the file is corrupt and (*i)->relatedTo is NULL
         {
             KCalCore::Incidence::Ptr parent = calendar ? calendar->incidence( (*i)->relatedTo() ) : KCalCore::Incidence::Ptr();
-            item = new QTableWidgetItem( parent ? parent->summary() : QString() );
+            item = new QTableWidgetItem( parent ? parent->summary() : (*i)->summary() );
             item->setFlags( Qt::ItemIsEnabled );
             item->setWhatsThis( i18n( "You can change this task's comment, start time and end time." ) );
             m_ui->historytablewidget->setItem( row, 0, item );