Hi,
Would it be possible to have more details about your issue ?
Generally a "blank page" means that you have a PHP fatal error (but not every time), so the best for you will be to check your PHP error log or to change the setting "error reporting level" to "maximum" in your Joomla global configuration.
Thanks to that, you can provide us the error message and it will help us to understand what is going wrong.
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.