I’ve created a new blueprint with Apache, PHP 7.0.3 and MySQL 5.5.60. Whenever I try to create a new Site with that Blueprint and open it’s URL, it just displays PHP code as plain text.
The only way I found to make it work is by changing PHP version (be it 5* or 7*) then changing it back to PHP 7.0.3.
I’m sorry about this issue. I was able to reproduce this locally as well with the same criteria you provided. I went ahead and filed an issue in our issue tracker. Keep an eye out for upcoming releases.