Hi,
I know you are looking at the problem at my site and I know it's a ' rare' problem but I figured it out.
There seems to be a problem converting articles from VM1 to VM2. That's what I did, I upgraded Joomla and Virtuemart with everything in it.. In the beginning all looked well but the more I installed (your template, some virtuemart plug-ins) the more problems I got. Especially with products that have custom fields on them and child products. Until yesterday I could'nt delete products with custom fields on them when they were in the shopping card. Th shopping card said: ' delete succesfull' but nothing happend, the
'remove' button didn't work. The only thing I could do to remove the product was to set the ordered amount to 0 and then refresh..
I have been reinstalling everything from scratch now, and made new products in Virtuemart and it works like a charm. Luckely 'm in the position I can do this because my previous installation of VM1 was not filled completely and not yet live.
Perhaps it can be of use to someone else who has got ' strange' problems not knowing where they come from and what to do with it.
thanks for your effort to help!