diff -r 5dc02b23752f -r 3e2da88830cd src/gui/itemviews/qheaderview.cpp
--- a/src/gui/itemviews/qheaderview.cpp	Tue Jul 06 15:10:48 2010 +0300
+++ b/src/gui/itemviews/qheaderview.cpp	Wed Aug 18 10:37:55 2010 +0300
@@ -1871,7 +1871,7 @@
 
     for (int i = 0; i < oldSectionHidden.count(); ++i) {
         if (oldSectionHidden.testBit(i))
-            q->setSectionHidden(logicalIndex(i), false);
+            q->setSectionHidden(i, false);
     }
 
     // the number of sections changed; we need to reread the state of the model