[imp] Entering S/MIME passphrase fails when sending email

[Edward Burr]

Horde Groupware Webmail Edition 5.1.4
Horde 5.1.6
Imp 6.1.7

If I am writing a new email and have not yet entered my S/MIME  
passphrase this session, when I click send, Horde promps me to enter  
it. But, when I do, a pink error message pops up and disappears too  
quickly to read, and the email vanishes and does not get sent.

The passphrase does apparently take effect, though, because I can then  
write the email anew and send it successfully.

My work-around for now is when I get that prompt, I cancel it, go to  
my mail preferences for S/MIME, and enter my passphrase there, then go  
click Send again, and the email sends successfully the first time.

Is this a bug, or is there some config option I'm missing? Any idea  
what that error message might be?
-- 
"In television it is a cardinal sin to allow the viewer a
single moment when his ears and eyes are not assaulted by
sound and fury" -- Alfred Hitchcock, announcing a commercial
break in "Hangover" aired 12/06/1962 and just as true today
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