I looked into source code of the webside in the part when 1 thumbnail is visible and other two are not (becouse i have added them thru CSVI Product files import,
The main image is stored somewhere else than the extra images.
What goes wrong is that CSVI is not creating the image resized/2b_90x90.jpg or something similar depending on the image size. Have you tried to not let CSVI create the thumbnails and let VirtueMart do so?
components/com_virtuemart/shop_image/product/components/com_virtuemart/shop_image/product/2b.jpg"
components/com_virtuemart/shop_image/product/components/com_virtuemart/shop_image/product/1b.jpg"
last two thumbnails are not visible becouse of the path. It looks like it twise instead of add /resized/ what is wrong .
These are not thumbnails though but the full images. Are you importing your image names as example.jpg or with the full path? If with the full path, you either need to remove the path from your import file.