KMail issues after update

[Stephen Davies]

Yesterday my Fedora 20 automatic updater installed 178 items; one of which 
seems to have been KMail.
KMail now says 4.12.3. I believe it was 4.12.2.
Since then,the KMail behaviour has been decidedly strange.

I can read mail, reply to mail and send mail but I cannot delete mail nor save 
it to folders.
Also, mail that has been read, does not change colour.

I am using KMail as a POP client with dovecot.
My folders are all below my home directory and look to be correct in terms of 
ownership and permissions.

Any ideas as to what has happened and what I can do to fix things?

Cheers and thanks,
Stephen
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