> However, you did touch on something. I usually try
> to update a mirror at least several times in succession,
> using the same, and then a slightly modified, URL list.

Ahah. Probably the update mechanism - the engine is not executing exactly the
same code sections during an update, and it _was_ possible to have a duplicate
entry, indeed.

I'll release an alpha 8 today, probably, that should get rid of this problem.