Billing and delivery Addresses are empty in checkout

[pepperoni]

Hi guys,

I am using version 1.4.0.17
As I had a problem with checkout validation (see here I have replaced some of the files in classes with files from the new version 1.4.2.5 to solve my problem. Thank God for that.
But...
Now when user is ordering, in the step regarding the addresses, the actual addresses don't display.
See first image below.

Just the step before that, in the summary the addresses display fine.
See second image.

Does anyone know what file(s) is/are responsible for that? If I know the file(s) I would replace them with the ones in my original version.