I have a question about GThumb...

I would like it to load on other distros I run as it does on Debian Sid, with thumbnails of the directory on the bottom, a tree on the left, and most important of all the ability to edit any of the pictures displayed.
The version in Debian Sid does this automatically....there is an edit icon on the top bar...Ubuntu 12.04 forces you to hit the "e" key while the thumb is selected, but the version I have on Centos doesn't seem to allow easy editing at all. I have gone through the preferences but none refers to my problem.

Any Gthumb experts around ??


Thanks