A change (1bf2498d311155bc4eb43edb4e6d3a04845d94c5) to make scramble buffers easier to understand appears to have made scramble buffers not the default behavior by accident. The logic would always evaluate such that scramble buffers is not used unless set explicitly.
I think the following little patch changes the logic to what was intended.
diff --git a/init.c b/init.c
index 427768c..a47186b 100644
--- a/init.c
+++ b/init.c
@@ -937,7 +937,7 @@ static void init_flags(struct thread_data *td)
* set. But if scramble_buffers has been set, always scramble.
*/
if (o->scramble_buffers && ((!o->zero_buffers &&
- fio_option_is_set(o, zero_buffers)) ||
+ !fio_option_is_set(o, zero_buffers)) ||
fio_option_is_set(o, scramble_buffers)))
td->flags |= TD_F_SCRAMBLE_BUFFERS;
if (o->verify != VERIFY_NONE)
----
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