Next step: now KMail freezes

 Now KMail freezes whenever I add gpgme-smime.so as a crypto plugin in KMail.

I have installed:
KMail 1.6.2
gpg 1.9.10
libgrcrypt 1.1.94
gpgme 0.3.16
cryptplug  0.3.16 
libassuan 0.6.6
libgpg-error 0.7
libksba 0.9.8

I double checked with ldd that all these refer to each other. What is a likely 
reason for GnuPG to freeze KMail like this? Where should I start looking?