This has to do with missing thumbnail option.
This is a brand new WP blog installed on a Dreamhost server. 2.3.3 was installed. The very first batch of 6 images were uploaded. Their sizes:
Pict 1 284 kb
Pict 2 396 kb
Pict 3 520 kb
Pict 4 632 kb
Pict 5 1.4 mb
Pict 6 2.5 mb
All pics are 72 dpi.
All except for 3 and 4 got the thumbnail option.
Dreamhost has GD library version 2 or above installed.
I was trying out WP PicLens. After I experienced the missing thumbnail option, I deactivated the plugin and re-uploaded Pict 3 and 4 that didn't have thumbnails.
It didn't make any difference. Still no thumbnail option for those two images.
The only other plugins I am using that are activated are
Breadcrump NavXT Core
All in One SEO Pack
Any other ideas?