Black screen with no content

I see black screen with no content. I have top refresh the browser 3-4 times before it appears:

Do you have a custom app host?

Yes I think so as have a pages/plasmic-host.tsx.

Any more help on this @yang?

Is this specific to your application host? You can try refreshing a a bunch of times there versus refreshing a bunch of times when adding debug=true to the end of the plasmic project URL, or just try creating a blank new project with no application host and refreshing that a bunch of times versus a blank new project with your application host