I received this email today and wondered if it influenced my recent trip (11/3-11/6). I'm Plat and have been receiving most upgrades before checking in but I wasn't in F on any of my legs to ORD (PBI-ATL-ORD).

-Email from DL:

We've resolved a technical issue with Complimentary Upgrade requests, but would like to confirm your preference.

Your reservation, XXXXXX, has been adjusted and now indicates that you are requesting an upgrade for your flight(s). Any future reservations, which may experience this technical issue, will also be adjusted to reflect an upgrade request. If you do not want an upgrade request on your flight(s), please contact Reservations at the phone number listed on the back of your Medallion® card.

Please visit the My Trips page at delta.com to view the upgrade status for your future flight(s). If your upgrade status displays "Upgrade Requested", you have successfully requested an upgrade for your flight and no further action is necessary for your upgrade to be processed.

We apologize for any inconvenience and look forward to seeing you on board soon.