PMDG 737-600 Auto speedbrakes

Hi All... I have been having a problem with the speed brakes not deploying automatically on the PMDG 737-600 upon landing. If others are having this problem, here is how you have to get them to work automatically upon landing. When you are on the glideslope and locked to the localizer with your flaps and speed set and the APPR button lit, about 4 to 5 miles from the runway, press the Shift + / keys to arm the speed brakes. The green notification light should come on and show that the speedbrakes are armed. The aircraft should flare about 50 feet from touchdown and then when the landing gear touches the runway, the speed brakes should deploy automatically.