For me the biggest current problem with GUI Editor is that I cannot use it without VPN.
(The same relates to the main page at babylonjs.com).
Forum and Playground use other hosting providers and currently I have no problems with them.
There were issues some time ago when PG was hosted at Netlify, but they disappeared completely after moving from Netlify to Azure (as far as I understand from IP addresses). Seems that the current problem is related to Google Cloud hosting.
I believe that in the nearest future nothing can be done with this issue but probably this information will be helpful 
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