Roger,
I am not sure what you mean by "images are rubish". Please submit a Ticket to Help Desk if the gallery uploaded through Shozam does not display correctly. The single known issue is related to Frontpage Server Extensions, which sometimes takes the liberty of modifying the HTML code during the upload.
http://helpdesk.shozam.com/
Note also that Shozam will upload all files again if there are changes to the way it generates HTML. When you first use a NEW version of Shozam to update a gallery created with an older version, the program will force the generation of all files to update your gallery to the latest "clean" HTML. As we are releasing new versions often, this means you may have to upload full often as well. As the program becomes increasingly stable and we do not make changes to the way we generate the gallery HTML, we may allow the program to not force the generation of all files on each new version. In the interim, the behavior explained above is needed to ensure there are no bugs introduced by having a gallery with various pages generated by different versions of the program.
Additionally, in some subsequent releases, we are planning to further optimize the workflow so the program is "smarter" about the specific subset of files which need to be generated. For example, if all you do is change a theme and leave all your other settings intact, to just generate and upload the few small files which are theme related. this way you will be able to change the look and feel of your gallery fast, easy and often as you please.
For the immediate future however, as we still may tweak some of the functionality and optimize general HTML code generated by Shozam, we will continue to require generating all pages with each new version released. It may take longer to upload all your files but you will be better assured that everything will work smoothly in your gallery. I hope you agree this is the right trade-off to make.