For the past several months, I've had little success applying GPUs myself. I always book flights with R (now PZ) > 0 and as soon as the ticket is issued I go back and click on the "Upgrade" button. Then I'd choose a GPU and apply it. This stopped working some time in the last quarter of 2018, and still doesn't work via the web site. I can select the GPU, but once I hit the "purchase" button the transaction aborts and nothing happens.

When I called in to apply the GPU, the agent confided that she has been getting a lot of calls for this recently. Has anybody been able to apply GPUs themselves via the web site?

Also when there is waitlisted connecting space (as there usually is in my experience with connecting to TATL or TPAC flights) these now show up with a mix of waitlist and upgrade requested indicators on the same PNR. One in each direction. I haven't actually flown any of these itineraries, so I don't know how much more (un)likely the connecting upgrades will be in these different pending modes.