When logging in today, I got the message for a Viewer update. Not having anything urgent to do, I gave it a go.
When I came online, all I saw was some prims I was wearing and my avatar was missing. As in gone. Not visible! Heh!
What a shame, because I think the last time I logged off, I really looked lovely!
No panic though, I have seen this glitch before and simply changing hair and a teleport fixed me :).