After two months of adding new features and bugfixing the first final version of the plugin is ready to be released to the public. The differences to version 0.5.6 are minor, just that the gallery list is sorted by alphabet now. I think I was able to solve all the issues you had with the plugin and I hope I will see many SimpleViewer galleries on Wordpress blogs in the future! Let's see what I can add in a future version of the plugin ;)
You can download the current version of the plugin here.
If you like the plugin, please vote for it on the plugin competition blog on this post.
