I am running a 2.4.4+ site and have noticed something interesting. Three times now I have had different students who show up in the online users block at odd times of day, but when I look in the course logs there is no activity for these accounts at all. Not even login attempts. Any ideas how this is possible? I have found that suspending the accounts and even changing the password has no effect - the names still persist in online users. The only way I have found around this is to delete the account altogether.
Thanks for any ideas.