K mail question

I am using Kmail at work with 3 email accounts, 2 work related that I have set
to remove mail from the server when I download it, an 1 personal account that
I use for Plug among other things. This account is set to leave mail on the
server as I want to be able to retrieve these messages at home also.

All of a sudden, when i retrieve mail on my personal account it is not marked
as retrieved so each time I download mail I get the same stuff over and over.
Any Ideas?

Charlie