claws-mail and smime plugin issue

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https://bbs.archlinux.org – I had s/mime working some times ago. After a few upgrades (pacman -Syu) it works but very strange. When I start claws-mail and trying to make new signed letter it fails with message:Could not queue message for sending: Signature failed: Secret key not found (End of file)Then I click some encrypted message, claws-mail says "Could not decrypt: No secret key" (I read message in SENT folder and this is right - I have no key for reading this messages - I sent it to other persone and I have no his key). After that I start again new signed letter and it is sending with no problem (with aski (HowTos)