Can't PM anyone, so a thread will have to do.
Basically, I have what looks like a bunch of dead/missing entries in my friendlist, presumably from players who either got banned, or otherwise deleted their character.
It is impossible to remove those players through normal means, they cause issues with the sorting of the friendlist as well (the list is all jumbled up, unless you add or remove someone, which forces a temporary sort on it). Even worse, the online/offline differentiation is also affected by this, which results in online players being somewhere in the middle, mixed up with the offline players.
See this screenshot for how it looks:
These "Unknown" players cannot be removed with the corresponding interface option, so I believe the only way this can be fixed is by manually removing the dead entries from the database.