With the 70D Beta-3 / 22th Dec with the Canon 111A firmware, the half-double click activation mode of the ETTR option is flakey. Sometimes it takes multiple (6+) attempts at double-clicking before the ETTR activates. Other times, it works the first and subsequent times, then gets flakey again. I see no obvious pattern as to what helps it to work.
Issue #2478 new