Our banner wouldn't load early on in the age. I've used the same banner file for 6 years, I'm sure that it meets the requirements. It did eventually load but at age start when I tried to load, I got re-directed to an "error" page that told me:
"http://utopia-game.com/wol/game/monarchy is temporarily unavailable"
No support is needed at this point, the banner loaded, but I am leaving this bug report because the bug occurred.
I didn't leave one earlier because of time constraints IRL and ingame.