01/14 - FLL-ATL 540AM flight - upgraded at gate when asked. Had a few seats open, fairly light flight - maybe 50 pax total
01/14 - ATL-RDU 820ish flight - upgraded at gate when asked, Only 5 seats (I think) filled, again, a fairly light flight

01/16 RDU-ATL - agent said I could sit in 3F or 2A, but couldn't assign me a seat for some reason. Told me to board with Zone 1 (which I am anyway). When I asked at podium, he said its suddenly full and to take my original seat.

01/16 ATL-FLL - 153PM flight - went to gate, agent said 1 seat left, then asked me for $49. Mentioned I was elite, then spent 5 minutes trying to upgrade me. Said she couldn't because of a restriction since I used a voucher, and that I have the exit row anyway.

A traveler on the flight is a senior manager @ FL and was talking to him, he said I should have been upgraded, regardless, on both flights. Guess there is a glitch in the system where if you use a VOUCHER (was a $25 off one), it paid for my exit row seat, and you can NOT upgrade if you do that.

This will make travel a bit more complicated for me and I'll have to play "russian roulette" and determine if I want to get stuck with the exit row and forget an upgrade when i use the coupons.