Page Builder layout doesn’t work anymore after 4.9.1 WP update

Hi,
After updating to WP 4.9.1 Page Builder started to mess up the layout of the pages that uses it. My site relies on Coaching theme and a few plugins. I have isolated the issue in this test page http://lionel-lahoun.ovh/page-test/. You can see that the layout of the blocks are displayed vertically instead of horizontally when I use a classic Row layout with fixed size (25%) for each cells . Until this WP update, everything worked great.
I have tried what you recommend by deactivating/reactivating one by one all the plugins but it didn’t fixed the issue (also cleared the browsers cache).
Any help appreciated
Sami