Thank you again or the plugin. I encountered an issue today and thought I would let you know.
I have updated from 0.6 to 0.7 and have observed that when I create a custom text field for a gallery and leave it activated for all galleries, the field is listed twice under the first gallery and is not listed under any of the other galleries.
To resolve the duplication problem, I go to the new custom field that I have defined, choose "edit linked galleries", use the "none" option, save, use the "all" option, and save again. After this work-around, the field only appears once, but unfortunately appears only within the first gallery.
I am running WP v2.8.3
When updating, I disabled the plugin, uploaded the new version overwriting the old one, activated the new plugin, and visited the update URL which generated a success message.
After encountering the issue, I deactivated, deleted, re-uploaded, reactivated, tested, had the same problem, ran upgrade link again, got success message, and tested again (had same issue).
Edit: added more info