When I choose "Show dropdown: Yes" in the module "Flexible - Virtuemart 3 Dropdown Shopping Cart", and I click on the button that appears in the dropdown to go to the checkout this doesn't work and my page freezes.
The plugin is enabled, so I don't see the problem.

Please help.

I found the problem.

Apparently when I want to go to the checkout it wants to open a secured address https and not the normal http. My browser didn't allow that.

Problem solved!

Glad to hear you resolved the problem.

Case solved, topic is closed.

Regards.