Hi,
There are two issues that I run into on a regular bases on multiple sites that use this component.
1. By default, payment form loads the bootstrap.css from /administrator/components/com_pmform/assets/bootstrap/css/bootstrap.css. This does not work when there is an .htaccess password on the administrator folder. I have edited /components/com_pmform/views/form/view.html.php to load from the front-end, but it would be good if this was default.
2. There is an issue when clicking back from the confirmation page. The Bootstrap CSS is lost and you are left with a simple form that looks nothing like the original.
Thank you!