Index: /trunk/src/VBox/Frontends/VirtualBox/src/globals/VBoxGlobal.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/globals/VBoxGlobal.cpp	(revision 33924)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/globals/VBoxGlobal.cpp	(revision 33925)
@@ -5006,4 +5006,10 @@
 
     mValid = true;
+
+    /* Cache IMedium data.
+     * There could be no used mediums at all,
+     * but this method should be run anyway just to enumerate null VBoxMedium object,
+     * used by some VBox smart widgets, like VBoxMediaComboBox: */
+    vboxGlobal().startEnumeratingMedia();
 }