That's a little harsh on the OP. He/she said he/she hasn't flown on Delta in a while. The rules have changed since they last flew on them, and he/she just wanted to know what the rules were now.

BeatCal, welcome back to DL! The way Medallion upgrades work now is this (it really helps if you have an ExpertFlyer subscription, and maybe KVS will work too?): out of the # of F seats DL is selling, they will make a certain number available for upgrades by putting them in V inventory. At the T-5 day mark, all DMs and PMs are upgraded, until V runs out or no more DMs/PMs are seated in coach (exception being those with non-DM/PM companions). If V is left, the process is repeated at T-3 for GMs, and then T-1 for FOs followed by Medallions with non-status companions. Anyone left over gets to wait for a gate upgrade.

It's quite normal to see FOs not getting upgraded at the window, and GMs are seeing that more commonly as well. One of the highly-discussed topics on the DL forum is whether the revenue management department at DL is correctly holding back the right number of F seats to sell, versus being released for upgrades.

I hope that clears things up, and happy travels!