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,
-- 
/\/\aurice