I did create on my home PC a secret gnuPG key. I exported it on a usb key, imported it on the notebook. KGpg agent is running and is functional. When I setup the "personality" that should use this signature in Kmail setup, the programm does not see the signature in the menu for "signature for signing" but it DOES see it in "signature for encryption". I can successfully encrypt mails with the key but I cannot sign them with it.
I then also created another signature, directly on the notebook this time, for another purpose, it works as usual, same notebook, same session.
In KGpg all signature appear normally, they are marked as completely trusted. Anybody experienced the same? Suggestions?

Kmail:1.9.10
KDE: 3.5.10 "release 50"