GPG again, again

I haven't had the need to send signed mails for a while, and suddenly it has 
stopped working.
When trying to send a signed mail the composer window stays disabled for like 
10-15 minutes, and the I get an error messages saying "Examination of 
recipient's signing preferences showed no common type of signature matching 
your available signing keys.
Send message without signing?"

When I click "No" I get a message "Error resolving keys. Please report a bug". 
Looking at the bug reports about KMail and signing/encrypting that is rather 
futile, so I will ask here instead.

I had it working just fine some months ago and I'm guessing some update broke 
it. GPG and encrypting/signing is all Greek to me but I do notice one new 
message in .xsession-errors although I don't know if it's relevant:

<update_cardinfo> 
get_card_status( "/home/tol/.gnupg/reader_0.status" , 0 , 0x7fd378052ec0 ) 
gpgagent_transact( SCD SERIALNO ) 
gpgagent_transact( SCD SERIALNO ): "Card error" 
</update_cardinfo> 
eventCounter: 4294967295 
ReaderStatusThread[2nd]: .zZZ
ReaderStatusThread[2nd]: .oOO
ReaderStatusThread[2nd]: new iteration command= "__check__"  ; nullSlot= true 
gpgagent_transact( GETEVENTCOUNTER ) 
get_event_counter(): got ( status( "EVENTCOUNTER" ) = "1 1 0" 
) 

This repeats every second or so. As I don't even have a card reader it would 
be better if it would stop querying for it.

-- 
Med venlig hilsen / Best Regards

Thomas Tanghus
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