In what way does it stop working when you rename the folder?
It needs to be checked without the theme but as you say
and its was working fine before applying the Theme... because we have some old accounts where we have saved the address for the users to check the payment part on the site....
does this mean (I'm assuming you have upgraded from VM1.1?) you added new addresses b4 the theme was installed - this is not what your statement says.. it says you have some old addresses
please rename the folder and set your template over-rides to default - then test your address saving.
This problem has never been reported and there is no logical reason why the theme would affect the address saving routine - it is the native VM2.0 appearing in a popup.. nothing else..
all googles for this error relate to problems of importing VM1.1. into VM2.0....
Please give us the full history of this site etc - version of VM etc - we are trying to help you but obviously we need more than one line answers..
Thank you