Index: /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UISession.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UISession.cpp	(revision 59888)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UISession.cpp	(revision 59889)
@@ -225,5 +225,8 @@
         case KMachineState_Teleported:
         case KMachineState_Aborted:
+        {
+            LogRel(("GUI: Aborting startup due to invalid machine state detected: %d\n", ms));
             return false;
+        }
         default:
             break;
@@ -285,4 +288,5 @@
         if (vboxGlobal().showStartVMErrors())
             msgCenter().cannotStartMachine(console(), machineName());
+        LogRel(("GUI: Aborting startup due to power up issue detected...\n"));
         return false;
     }
@@ -313,4 +317,5 @@
         if (vboxGlobal().showStartVMErrors())
             msgCenter().cannotStartMachine(progress, machineName());
+        LogRel(("GUI: Aborting startup due to power up progress issue detected...\n"));
         return false;
     }
@@ -1821,5 +1826,8 @@
             machineLogic()->openNetworkSettingsDialog();
         else
+        {
+            LogRel(("GUI: Aborting startup due to preprocess initialization issue detected...\n"));
             return false;
+        }
     }
 #endif /* VBOX_WITH_NETFLT */
@@ -1911,4 +1919,5 @@
             bool fServerCrashed = false;
             powerOff(false, fServerCrashed);
+            LogRel(("GUI: Aborting startup due to postprocess initialization issue detected...\n"));
             return false;
         }