Sorry for the delay in responding. I'm in the middle of moving, and have had a lot on my plate the last few days.
I've tried powering it by PoE from the switch (which has worked just fine, until now), and also tried by injector. This AP has been up and running like this for several months, through power issues, my tinkering, etc; without issue. I find it funny that this suddenly stopped working, although nothing has changed for a while.
I looked for the SetMeUp SSID. Never showed. The radios didn't even come on. CLI just showed in a degraded state, and other than factory reset it from the boot loader, it isn't behaving. I even tried the reset button. No dice. As far as I know, the regulatory domain hasn't changed from U.S.
I needed an IAP running, and reset an IAP-205 to get things running, and it is working on the same setup without issue. I usually just connect to the SSID, and configure from there.