I have set up an event following the same guidelines as previous events. However, when I select a “free” ticket, I am taken to the registration form and everything seems to be working. When I select a ticket with a price associated with it, I am taken to a blank page. We use only one payment method, PayPal Commerce, and none of this has changed since our last event in May.
Add that in Appearance -> Customize -> Additional CSS.
That should fix this for you.
The problem is we use an element hidden no the page (set to have a margin-left of -9999em so it loads off the page) to direct users right before the checkout but on some themes that causes the main element to load off the page and you cant see it.