Topic on Extension talk:Mermaid/Flow

I am running MW 1.35 and installed Mermaid 3.0.0 and used the following syntax from example, A blank page is rendered, i also tried using the dev-master instead of 3.0.0 still nothing, i tried version 2.2.0, and then there is just a loading gif :

{{#mermaid:sequenceDiagram participant Alice participant Bob

 Alice->John: Hello John, how are you?
 loop Healthcheck
      John->John: Fight against hypochondria
 end
 Note right of John: Rational thoughts 

prevail...
   John-->Alice: Great!
   John->Bob: How about you?
   Bob-->John: Jolly good!

}}

I'm getting the same issue, lots of loading gifs and blanks.