Hi,
Thanks, I now see the problem.
It is not really a problem ; first I though there was a javascript problem with the category tree but in fact, you have a HikaMarket configuration which restrict the vendor in a specific category.
I tried to summarize it in the vendor tutorial documentation page :
www.hikashop.com/support/documentation/1...html#tuto_first_conf
If you look at the HikaMarket configuration screenshot, you will see the section "Categories Options".
HikaMarket can create a specific category for each vendor and restrict him into that category.
If you remove the option "Change vendor root category" (set it to "no"), the restriction will be removed and your vendor will have access to every categories of your website.
When editing an existing product, the vendors will see the categories of their products even if the category is not in their "category tree". They can remove such external category but they can't add them.
Hope my explanation is clear enough.
Do not hesitate to ask for details or reformulation if required.
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.