Seems obvious now you say it
I closed Armory, started Bitcoin-QT, and it's now catching up on the past 2 days.
After it's up to date, I'll close it and start Armory again.
If that doesn't work, I'll close Armory, start bitcoind.exe, let it work for 5-10 mins, then open Armory.
I say this because the last time I got Armory working was by starting bitcoind.exe, gave it afew mins until its memory usage stopped rising, then started Armory which worked. (As letting armory start bitcoind didn't work for whatever reason.)
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I did think it was odd that Armory didn't say something like "Armory needs bitcoind running in the background", but I won't go making any non-constructive remarks about that
Hopefully this'll work. (Yes, thistle.)
Cheers