Hi,
We have a similar issue reported (in the french forum section).
www.hikashop.com/forum/5-support-en-fran...hop-remarketing.html
But the report is for HikaShop 2.5.0 ; so I guess that the issue might not be linked to HikaShop version number but maybe with a modification in Joomla which does not allow the plugin to work properly.
Which Joomla version number are you using ?
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.