Index: /trunk/src/VBox/Devices/VMMDev/VBoxDev.cpp
===================================================================
--- /trunk/src/VBox/Devices/VMMDev/VBoxDev.cpp	(revision 12408)
+++ /trunk/src/VBox/Devices/VMMDev/VBoxDev.cpp	(revision 12409)
@@ -2379,4 +2379,7 @@
     /* disabled statistics updating */
     pThis->u32LastStatIntervalSize = 0;
+
+    /* Clear the "HGCM event enabled" flag so the event can be automatically reenabled.  */
+    pThis->u32HGCMEnabled = 0;
 
     /*