The Mikado Gallery errors out at the point of creating a gallery. Not sure if it's trying to create a new database table, write to a directory that may be off limits, or other.
Either way, I believe that these galleries work on a standard install of Wordpress. Not sure if you know of a gallery plugin that works with this Heroku+S3+Wordpress stack or not, or if the underlying issue can be addressed.
So I've tried to install the Mikado Gallery (http://codecanyon.net/item/mikado-grid-gallery-for-wordpress/7028624) and the Simple Viewer Gallery (http://www.simpleviewer.net/simpleviewer/support/wp-simpleviewer/) and neither will work. I even tried the Next-Gen Gallery and was unable to upload images (probably an S3 issue with WPRO).
The Mikado Gallery errors out at the point of creating a gallery. Not sure if it's trying to create a new database table, write to a directory that may be off limits, or other.
Either way, I believe that these galleries work on a standard install of Wordpress. Not sure if you know of a gallery plugin that works with this Heroku+S3+Wordpress stack or not, or if the underlying issue can be addressed.