Some attachments are not displayed.

This most likely means that the attachments are included in an rich (HTML) message in a non-standard way. Since Mac OS X 10.5 “Leopard” Mail ignores these attachments. This behavior is not related to Attachment Tamer.

Workaround: Go to Attachment Tamer preferences and switch to the Advanced tab. Activate the Show hidden attachments option. You may need to quit and relaunch Mail in order for the option to take effect in recently displayed messages.