Hi,
i have the same Problem, my shop have over 30.000 products and more pictures.
For the best Server Performance i must put the product images in subfolder.
In the CSVImproved List i write this string into the full_image row:
i.e. subfolder/image.jpg
But after import no image is displayed

So I´ve found a forum Post to change in components/com_virtuemart/show_image_in_imgtag.php this:
$basefilename = @basename(urldecode($_REQUEST['filename']));
to this:
$basefilename = urldecode($_REQUEST['filename']);
So good by the first look, the thumbs are display but the next problem i have with full_image.
The url in the statusbar is absolut correct but after klick on the thumb no full_image is loading.
http://www.growinger.de/components/com_virtuemart/shop_image/product/200623%2FalchPP461.jpg
the Problem is the Slash in the CSVI textstring subfolder/image.jpg is generated in subfolder%2Fimage.jpg
Can anybody help me?
regards chevron08