default view format / fleximage

I've been having a problem of late with view formats. I am using the FlexImage plugin to provide thumbnailing which adds its own view tempaltes.

I would usually access a my resource via


Since photo is my model I would normally see the rendered app/views/photos/show.html.erb instead I am getting app/views/photos/show.jpg.flexi

I am just wondering, is the view that is used defaulted to the first alphabetically. Its very confusing I assumed that the format is defaulted to html somewhere unless otherwise specified. If that is the case in development I am getting the html view displayed, but in production it defaults to jpg which is crazy. It seems to inconsistently switch between the two.

Does this ring any bells with anyone?