I posted this in mozillaZine, and was told maybe you could help me.
I have just installed TB in a fresh Ubuntu 12.10 (amd64) installation and every file icon shown inside of Thunderbird is missing. That means that attachments have no icons. This is what I mean:
I have tried updating Thunderbird through software updater, even tried with the Mozilla build found at https://www.mozilla.org/en-US/thunderbird/
. Also tried reinstalling Ubuntu, and installing it in a virtual machine (i386 version), and they all have the same issue.
I have the same version of Ubuntu in another PC and in a Laptop and none have this issue. Could it be hardware related? That's the only difference between them...