Hi Out2Lunch. What version are you ugrading to? I am about to go to 1.39h next week - The new PCI data security arrangements means that Worldpay won't accept payments from us if we don't have the latest version running. I have found that 1.38a worked perfectly since I installed it - not really looking forward to finding the needle in the haystack again if 1.39h causes problems. Did you upgrade to the latest version of PHP as well? (this is also a requirement of the PCI stuff)

Are you getting any error messages? If the shop doesn't return to the store, then the very useful debug feature won't give any information either...

Did worldpay shed any light on the problem? I have found that the Singapore support guys (I am in Oz) are actually quite useful.

Regards
FEQ