Having suffered from the "Lose Your Bank Upgrade & Bank Items" bug this morning, I logged in this afternoon to find all my guild memberships had been wiped as well as my friends list. I am currently guildless *and* friendless... /sigh
I've requested a Re-Invite via the membership dashboard, but thought I'd just let you know I hadn't left of my own volition!
Nevermind! By the time I'd written this and gone back to my gaming computer, my guild list was back!