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Plugin works but i see no thumbnails

This issue might be caused by several problems. Check the following list.

1. Thumbnails are rendered using the PHP GD libraries. These should be enabled on your server. Do a phpinfo() on your host to check if they're installed properly. Contact your hosting support to know how to enable them.
2. Another problem could be that you're hosting the plugin on a MS Windows based machine. This will probably change the encoding data inside the files and could lead to several malfunctions. Better to host on a Unix/Linux based enviroment.
3. External images are not allowed. This means that if you're trying to generate a thumbnail from an image hosted on a different domain, it won't work.