How can I use a new template for a variant? When I try to create a new variant, I can only choose the "Blank" template. Does anyone knows?

Hi Isabel - there was a small issue with our deployment of the new Mobile Responsive templates that cause this issue. You should be able to create a new variant from any of those templates now though (you may need to logout and then log back in though). Please let me know here or via support@unbounce.com if the problem persists though!