Sounds like the exact same glitch. I don't know if it happens only for kiosk boarding passes or Web check-in as well (guess I'll find out this morning, when I print my boarding passes for the return from BUR tomorrow -- I was in an immediately upgradeable fare class for tomorrow's return flight, but used coupon upgrades for the flight down).

The Alaska CSR was kind enough, though, to put a note in the record of all three RTs I had coming up where I used coupon upgrades in one direction only -- hopefully, that'll convince the CO personnel in EWR next month on my remaining two flights that I don't need the coupons every time.

Ever the optimist. I've printed out the CSR emails, just in case.