here be screenshoot : http://imageshack.us/photo/my-images/27/spiral20111201170058.png/

the hud was showing normally the level before and came back the level after.

The only thing that I did that might be connected to this is that I left the group I was in while on the loading screen ( pressed f6 to bring up the social panel, and selected the "go solo" on the party tab)