After I update the theme, visual composer works not properly.
Therefore, I fixed two things below.
-woocommerce system status notified me to upgrade the WP memory limit to 64 MB from 42 MB,
so I upgrade the memory limit.
-I also update PHP to 5.6.12 (which is newest).
However, visual composer is still not working.

When I try to add text block, it becomes like that.

When I try to modify the visual composer element that was already set up, I can’t fix anything and freezes like this.
Please tell me the solution.
Regards