Index: /trunk/src/VBox/Runtime/common/misc/messagerefentry.cpp
===================================================================
--- /trunk/src/VBox/Runtime/common/misc/messagerefentry.cpp	(revision 79806)
+++ /trunk/src/VBox/Runtime/common/misc/messagerefentry.cpp	(revision 79807)
@@ -245,5 +245,5 @@
     uint32_t cPendingBlankLines = pcPendingBlankLines ? *pcPendingBlankLines : 0;
     uint32_t cLinesWritten      = 0;
-    uint32_t cchWidth           = getScreenWidth(pStrm);
+    uint32_t cchWidth           = getScreenWidth(pStrm) - 1; /* (Seems a -1 here is prudent, at least on windows.) */
     uint64_t fPrevScope         = fScope;
     int      rc                 = VINF_SUCCESS;