issue with checkout process sometimes it works sometimes it doesn't?

Hi im having some issues with the checkout process.

not sure whats changed but while logged onto the same account i tried checking out marketpress products and Appointments. first time round seems ok and worked ok but 2nd time page just reloads endlessly on the shipping stage?

Is is possible to check if the code thats being used there is to the correct domain and not linking to old domain path ?

Current domain: http://tinyurl.com/qdyvodl
Previous domain: http://tinyurl.com/kwx84nn

sorry its long video tested out whole system but if you skip to around key areas as follows
1:57 / 3:50 / 7:30
http://monosnap.com/file/U0x4BodI4k8BCfnoneO9XyoP35fhqc

also need to be logged in to view appointments / purchase - can you create a temp account?
or use this testing account

user: aicee
pass: asdf

Support access is open

Thanks
Tom