Hi,
I have made yesterday some modification in plugins for Joomla 3.0
The configuration structure changes in Joomla 3.0 and the patch would fix the "sitename" in the plugin.
It is possible that, re-downloading HikaShop 2.0, would solve your problem.
Best 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.