Index: /trunk/src/VBox/Additions/common/VBoxGuest/VBoxGuest.cpp
===================================================================
--- /trunk/src/VBox/Additions/common/VBoxGuest/VBoxGuest.cpp	(revision 54720)
+++ /trunk/src/VBox/Additions/common/VBoxGuest/VBoxGuest.cpp	(revision 54721)
@@ -2629,5 +2629,5 @@
     fPrevious = pSession->fEventFilter;
     pSession->fEventFilter |= fOrMask;
-    pSession->fEventFilter &= fNotMask;
+    pSession->fEventFilter &= ~fNotMask;
 
     /*
@@ -2778,5 +2778,5 @@
     fPrevious = pSession->fMouseStatus;
     pSession->fMouseStatus |= fOrMask;
-    pSession->fMouseStatus &= fNotMask;
+    pSession->fMouseStatus &= ~fNotMask;
 
     /*