Hi,
I think you got an issue with the "chosen" javascript library which change the display the dropdown list.
When you change the variant, some elements of the page are replaced dynamically and it looks like the dropdown modified by chosen is replaced by the javascript code is not working anymore.
It will require some modifications in the javascript in order to re-initialized the chosen dropdown ; so in the first time I think the best will be to deactivate the library temporally.
You will find the option "use chosen library" in your HikaShop configuration.
www.hikashop.com/support/support/documen...html#display_general
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.