Hi,
Thanks for the report.
It looks like there is some CSS issues with the bootstrap popup. The backend template includes some CSS for that but not the front-end one. And there is also some missing parameters.
I'll investigate in my local website.
In any cases, Vex is now the recommended popup system in HikaShop and is set by default for new installations.
Squeezebox uses Mootools and Bootstrap is not managed (or partially managed) by templates.
With Vex we are sure that the popup will work and that the CSS is fine.
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.