I have noticed this as well but only on the jets with updated ACARS software. You can tell by the absence of the IRS drift input screen & lack of close out printing. Anyone else been able to correlate this update with the landing issue? I called coordination 3 days later when I noticed a couple of landings missing & they gave me grief because I didn't call within 24 hours...funny since I had no printout to catch it on my end w/in 24 hours.