On 13/12/2012 at 12:59 I said:
However, after logging out and back in again, the situation has reverted to normal.
But it has just started again - and not preceded by that LIST error this time. (3 incoming emails ruined)
So I am having to abandon Trinity and revert to KDE4, until/unless this crazy KMail behaviour can be stopped...
With sincere regret,