Bit of a weird one, I’ve been playing with the following project and remixing my own without any issues on the free service. Today I subscribed and paid and since then the existing projects no longer run (just blank preview/landing url) and even if I try and remix a project again, I still get blank preview/landing url.
Yeah I am running into the same thing. No new projects can be created – I just get a white page/nothing loads. Tried in incognito as well. I filed a support ticket.