Sorry for the untimely reply.
Glad you got your website back up.
1- CircleFlip has limited Child Theme support, you can do the basics of overriding functions.php and style.css
No blocks however
2- Circleflip have been tested with WPML, and we’re currently re-doing tests with the OnTheGo team of WPML.org
nonetheless please feel free to report any problems you face with CF and WPML and we’ll gladly check it out
3- CF portfolio plugin, is used to add portfolio elements, if you are not planning to have portfolio elements, you can disable it no problem
I am keen on knowing what was the problem the plugin caused.
So please if you have time, let me know the steps you took so that I could replicate the problem and try and find a solution