Hi,
Please check the HikaShop version in the file source code (you will find it in all HikaShop PHP files).
We can't say why you have blank pages but I think that you have some PHP errors or maybe some elements missing in the database.
You will need to make some debug and check your PHP error log.
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.