Index: /trunk/src/VBox/Main/src-client/GuestDnDPrivate.cpp
===================================================================
--- /trunk/src/VBox/Main/src-client/GuestDnDPrivate.cpp	(revision 55243)
+++ /trunk/src/VBox/Main/src-client/GuestDnDPrivate.cpp	(revision 55244)
@@ -282,5 +282,5 @@
         rc = m_progress->init(static_cast<IGuest*>(pParent),
                               Bstr(pParent->tr("Dropping data")).raw(),
-                              TRUE);
+                              FALSE /* fCancelable */);
     }
     return rc;
Index: /trunk/src/VBox/Main/src-client/GuestDnDTargetImpl.cpp
===================================================================
--- /trunk/src/VBox/Main/src-client/GuestDnDTargetImpl.cpp	(revision 55243)
+++ /trunk/src/VBox/Main/src-client/GuestDnDTargetImpl.cpp	(revision 55244)
@@ -432,7 +432,6 @@
         if (RT_SUCCESS(rc))
         {
-            /* Query the progress object to the caller. */
-            if (aProgress)
-                pResp->queryProgressTo(aProgress.asOutParam());
+            hr = pResp->queryProgressTo(aProgress.asOutParam());
+            ComAssertComRC(hr);
         }
     }