Fist thing to do:
Disable all plugins but this one and see if it is working fine.
- if yes : one or more plugins are messing up with this one, actvate them one by one and tell their author that their plugins are messing with this one.
- if not : the theme does not allow the plugin to work fine and you will have to investigate more...
If the theme don't allow the plugin to work
Try the shortcode way to insert the plugin and add the default shortcode into some post content and display this post as a single post : if the slideshow is working fine, the index page of theme is not compatible with the plugin.
- if you think you can : edit the index.php and header.php of your theme to see what you can do
- contact the theme author and ask him for help
Before to post a support question
Try things into the first chapter of this post and note the result of your investigations.
Let me know your WP version, Theme name (and URL), eventually email me the url of your WP, some screenshots or the source code of the incriminated pages.