Notice: Undefined index: custom settings in field_view_mode_settings()

Not sure what the deal is here, the full log error reads like this:

Notice: Undefined index: custom settings in field_view_mode_settings() (line 631 of /path/to/site/field/field.module).

I create a new gallery, and when I go to look at it I have a semi-wsod... some of the content has loaded in the DOM but the theme doesn't show and everything is stuck to the left side of the screen. Looking at the page source I can see most of the content from page.tpl.php, but nothing from html.tpl.php which is what I think is causing the semi wsod.

When I head over to admin/content/media I see thumbnails and list just fine, so I don't think it's an issue with the media module (I'm still on b4). However, I get a ton of log messages whenever I visit the page that read thusly:

Notice: Undefined property: stdClass::$override in theme_file_styles_image() (line 16 of /path/to/site/sites/all/modules/styles/contrib/file_styles/includes/themes/file_styles.theme.inc).

My version of the Styles module is: 7.x-2.0-alpha5

Any pointers would be appreciated! I did search for related threads in the issue queue, but I only found something from december 2010 which I felt was outdated by now.