Claws mail hangs when I try to send a message to two addresses; one that I have the gpg key for, and another that I have no key for. When clicking the "Other" button on the "Select keys"/"No exact match found for .." window, claws mail seems to hang. I cannot type anything in the text box, and the ok/cancel/window close buttons do not react.

Steps to reproduce:
1. Start claws mail
2. Create new email
3. Two receipients: one you have the gpg key, one you don't have it of
4. Send
5. In the "select keys" window, click the "Other" button
6. The "Add key" window appears. The cursor blinks on the text input field. When typing, nothing appears in the text field. The OK and Cancel buttons do not react. The window close button does not react as well.


Screenshot: http://fotostore.cweiske.de/screenshots/2013-05-09%20claws%20mail%203.9.1%20gpg%20hangs.png