It's been a week since our last attempt to fix the "Logged in as someone else" bug and the thread has not resurfaced in that time so I think we might have cracked it.
I just wanted to check though, have any of those affected seen the wrong username appear recently?
nope, not seen that for a while but the load times are sometimes very sloooooooooooow and I get the 'Oooops - somethings not quite right' page every now and again