When loading the Boards feature (I know it's beta), I get the following message on the top right:
Connection interrupted. Retrying...
It's always there. The selected board loads but changes to the board do not save to Trello.
The concept is nice but it's not working. I've tried with extensions disabled with the same result in Chrome, Firefox and Microsoft Edge.
Attached are the two requests that seem to be failing. I didn't expand the view in case the info is sensitive.