nickiaq

I ended up using Force Regenerate Thumbnails instead.

Thank you for the detailed answer so quickly. I did not realize that Revisr tracks the database as well. That is mighty useful.

Thank you also for developing this great plugin!

Sure thing.

Background:
I am developing a new theme from the ground up to replace the existing theme on a site with posts and media going back to 2004. It has ~8 custom post types, ~10 custom taxonomies, and custom widgets, metaboxes and fields, but it maintains backwards compatibility with the old theme with the exception of new metaboxes/fields. This new theme, however, uses different image sizes, which is a very small difference in light of other changes.

So, I have the theme nearly complete and wanted to do a test of migrating all of the users/posts/attachments and such. And, after some work in mysql to fix some of the other incompatibilities with taxonomies, I wanted to use this plugin to regenerate the images in the new image sizes.

The Nitty Gritty:
However, after regenerating thumbnails for hours (pictures since 2004!!), wp_get_attachment_image_src() and similar functions would not work with any custom image sizes. Instead of getting the custom size, the images/src/etc would get the full size.

I did some research and found that people have had trouble in the past (with this plugin) with clearing meta data. That is to say that the plugin will re-crop the images (ie. the files exist), but wp_get_attachment_metadata() would be empty.

Conclusion:
It is entirely possible that something with my setup is conflicting with the plugin. But, I thought I would put my trouble out there for others to know.