Decoration for GnuPG disappeared

Hello all,

I'm trying around with KMail and GnuPG. Usally a mail with a signature or an 
encrypted mail are decorated with a yellow/green/red/blue decoration.
Unfortunately yesterday I press "Details Ausblenden" (English Translation is 
maybe "Hide details") and now the decoration is gone (but only in all mails 
from this one email-address).
How can I reactivate it?

I use KMail 4.10.2.

Could you please CC me or the list, when you answer?

regards,
Gerion


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