diff -r 5af6c74cd793 -r af6ec97d9189 userlibandfileserver/fileserver/sfile/sf_cache_man.cpp
--- a/userlibandfileserver/fileserver/sfile/sf_cache_man.cpp	Wed Jun 23 11:59:44 2010 +0100
+++ b/userlibandfileserver/fileserver/sfile/sf_cache_man.cpp	Wed Jun 23 12:52:28 2010 +0100
@@ -177,7 +177,7 @@
 	iMaxLockedSegments = TGlobalFileCacheSettings::MaxLockedSize() >> KSegmentSizeLog2;
 
 #ifdef __SIMULATE_LOCK_FAILURES__
-	iSimulateLockFailureMode = ETrue;
+	iSimulateLockFailureMode = EFalse;	// off by default unless switched on by KControlIoSimulateLockFailureMode
 #endif
 	}