Index: /trunk/src/VBox/Main/DisplayImpl.cpp
===================================================================
--- /trunk/src/VBox/Main/DisplayImpl.cpp	(revision 421)
+++ /trunk/src/VBox/Main/DisplayImpl.cpp	(revision 422)
@@ -736,5 +736,5 @@
     if (cbDst >= VBVA_RING_BUFFER_SIZE)
     {
-        AssertFailed ();
+        AssertMsgFailed (("cbDst = 0x%08X, ring buffer size 0x%08X", cbDst, VBVA_RING_BUFFER_SIZE));
         return;
     }