Marketpress hanging on last stage of order and not sending confirmation emails anymore

Hi there, I need help please, just installed the paid version of marketpress (only ver2.4 as my WP is 3.3.1)

Something happened now that on the final stage (Order Confirmation) stage the website just hangs, also I don't see ANY confirmation emails sent. This all used to work perfect before ?

Tried rolling back to all my wordpress-ecommerce plugin backups but now it happens all the time ?

I do however see the order in the Manage Orders ?

Could someone please please help me out?