I've just upgraded to the latest version of the plugin (4.4.75). The boxes are still working but the colouration and icon have disappeared, I thought this might be because I'd used my own style but I've tried with a standard style and the results are the same.
You can see the problem here: Sailing Choices. The first box on the page now calls the download style, the other boxes use my custom style.
I guess it's something simple but I'm not very technical so can someone tell me how to fix this as I love this plugin. Many thanks