We've been using this plugin for a few weeks and it's exactly what we need for our website Fee Calculator (thank you!).
However since we updated to WordPress 3.6 last week, it hasn't been working. All the settings are there, but it isn't showing on the page when using the short code in the text editor.
We've tested it on a separate page, but it still isn't working. It's a crucial part of our website, so we need to get it up and running again ASAP.
How can we fix it?