I strongly suspect this is a unity bug and not an empathy one, I've had the same thing, and then the window has appeared after I for example switch workspace.
Windows also tend to disapear like this when dragging between workspaces.
I strongly suspect this is a unity bug and not an empathy one, I've had the same thing, and then the window has appeared after I for example switch workspace.
Windows also tend to disapear like this when dragging between workspaces.