On Tue, Aug 20 2013, Istvan Marko <notmuch@kismala.com> wrote:
> Jameson Graef Rollins <jrollins@finestructure.net> writes:
>
>> However, the behavior of the part button that now appears seems to be a
>> bit strange.  Clicking/hitting enter on the part attempts to save it
>> rather than open it.  
>
> This is controlled by notmuch-show-part-button-default-action. 
>
> There are also the "." bindings, hit ". C-h" to see them.

Hi, Istvan.  Yes, I'm aware of these options, and they're not the issue.
This button is behaving differently than buttons for inline image/*
parts in other messages.

jamie.