What version of Virtuemart did you modify and what version of CB are you testing it with? Since I will be testing it, where do you want us to post bugs?
I was going to help by doing some testing too... but I'm not sure, as I'm not a technical person at all... I see 3 files in Source code. Do we have to download them and replace the existing equivalent files in com_virtuemart ? Because I can see the index.html and virtuemart.php but no virtuemart.xml.