Hi there,
Ok, So I’m up to speed now. So Did you try refreshing the page after it says “loading”
It has the original flash restored to the grove_VI2 but it’s not completing.
This is the weird part for me ? Something is definitely sideways then.
Let me try and break mwine , I have two. 
the only time it got stuck , I refreshed the page after getting tired of waiting… and the thing came back working in the preview window, and I was able to deploy it then, and it does work…Hmmm?
Do you get the popup for it to connect ? in between steps?
LMK,
HTH
Gl 
PJ 