diff -r 56cd8111b7f7 -r 41300fa6a67c src/gui/widgets/qmainwindowlayout.cpp
--- a/src/gui/widgets/qmainwindowlayout.cpp	Tue Jan 26 12:42:25 2010 +0200
+++ b/src/gui/widgets/qmainwindowlayout.cpp	Tue Feb 02 00:43:10 2010 +0200
@@ -1641,6 +1641,9 @@
         savedState.clear();
         currentGapPos.clear();
         pluggingWidget = 0;
+        //applying the state will make sure that the currentGap is updated correctly
+        //and all the geometries (especially the one from the central widget) is correct
+        layoutState.apply(false);
     }
 
     if (!widgetAnimator.animating()) {