Index: /trunk/src/VBox/Frontends/VirtualBox/src/runtime/fullscreen/UIMachineViewFullscreen.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/runtime/fullscreen/UIMachineViewFullscreen.cpp	(revision 58012)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/runtime/fullscreen/UIMachineViewFullscreen.cpp	(revision 58013)
@@ -209,5 +209,5 @@
         sltPerformGuestResize(workingArea().size());
         /* And remember the size to know what we are resizing out of when we exit: */
-        uisession()->setLastFullScreenSize(screenId(), workingArea().size());
+        uisession()->setLastFullScreenSize(screenId(), scaledForward(scaledBackward(workingArea().size())));
     }
 }
Index: /trunk/src/VBox/Frontends/VirtualBox/src/runtime/seamless/UIMachineViewSeamless.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/runtime/seamless/UIMachineViewSeamless.cpp	(revision 58012)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/runtime/seamless/UIMachineViewSeamless.cpp	(revision 58013)
@@ -217,5 +217,5 @@
         sltPerformGuestResize(workingArea().size());
         /* And remember the size to know what we are resizing out of when we exit: */
-        uisession()->setLastFullScreenSize(screenId(), workingArea().size());
+        uisession()->setLastFullScreenSize(screenId(), scaledForward(scaledBackward(workingArea().size())));
     }
 }