Can you elaborate on the db issue (as it seems to be known)? I can’t grant you access to the site, but I would appreciate some help in debugging.
The thing is – user has complete control of the original image (can use any optimization tools when preparing the image for upload), but not so much control of all the thumbnails WP generates.
And there’s where the plugin can help users like me, who can take care of their images on hard drive, but look for better method than default WP resampler.
How about removing those captcha IDs from the dashboard list?