Hi Burek,
I had the same issue on a site I'm building for a client.
Tested on versions
Joomla 1.0.13
Virtuemart 1.0.13a
Sobi2 2.8.2
JoomSef 2.2.4
Extract and open com_virtuemart.php from zip file
Before line 23
$title = array();
Add
$title = array();
$title[] = 'shop'; // you can change the word shop to cart or whatever you like
$title[] = '/';
comment out lines 23-34
/*$title = array();
*$this->params = SEFTools::getExtParams('com_virtuemart');
*$prefix = $this->params->get('prefix');
*if (!$page){
* $title[] = $prefix;
* $title[] = '/';
* $title[] = "index";
* } else {
* $title[] = $prefix;
* $title[] = '/';
* }
*/
Save and upload file to components/com_sef/sef_ext/
Updated: Thanks Arsoy, I should have mentioned this as well.
Important: don't forget to purge the sef urls and clean the cache after applying the above fix.
If all OK you can remove the commented out lines and re-upload.
This solved the double // issue and named my cart 'shop' with main page URL of domain/shop/index.php
Another great plugin Fallen, thanks.
Hope that helps
Cheers
Jim
www.xactit.com