When making a Worldpay payment the thank you page is correctly displayed (embedded in a Worldpay screen) When you CANCEL the payment the screen is all messed up due, I believe, to their being no base href. The successful payment is handled in thanks.phtml - where is the cancel handled? It also reports a database error message when cancelling. How can I see the log of the error.
Can you contact us in helpdesk and provide access info? I will help to fix this and include fix in next aMember releases so it will not be overwritten by upgrade.