If a theme includes an icon key_pgp_signed.png or key_pgp_signed.xpm, Claws still displays the stock key_pgp_signed.xpm from the default theme. The documentation and says it is called key_pgp_signed.xpm (or png), and this is the name used in existing themes, but the code looks for a file key_pgp_signed_xpm.png and then falls back to the stock key_pgp_signed.xpm.
Changes related to this bug have been committed. Please check latest Git and update the bug accordingly. You can also get the patch from: http://git.claws-mail.org/ http://git.claws-mail.org/?p=claws.git;a=commitdiff;h=5c96a1b73d33e9e3c3cf2ccf5cd508b8a2a9c10c Merge: ab7cabb cfe7f78 Author: Colin Leroy <colin@colino.net> Date: Wed Oct 23 15:39:03 2013 +0200 Merge branch 'master' of file:///home/git/claws http://git.claws-mail.org/?p=claws.git;a=commitdiff;h=cfe7f78faa46f3d9f5c145c74da3bebcb8495de8 Author: Paul <paul@claws-mail.org> Date: Wed Oct 23 14:38:32 2013 +0100 fix bug 3021, 'Icon key_pgp_signed always shows as the default, never the themed version'
This appears to be fixed in the 3.9.3 release.