cart Add/Edit billing address not working after Use URL Rewriting set

[EinsteinOz]

Hi, I wonder if you can help please.

I am using VirtueMart 3.0.6.2 and Joomla 3.4.1 and up to date PHP version

My cart Add/Edit billing address information link does not work once the Joomla settings "Search Engine Friendly URLs" and "Use URL Rewriting" have been set to "yes". The website url is showing a link to user/editaddresscartBT once Add/Edit billing address is clicked but the website homepage is displayed.  This works fine when those two settings are switched off..

Thank You