I have managed to resolve the issue by loading Trello on a completely open internet connection. I was previously sitting behind a Unified Threat Management gateway (UTM).
This has resolved the list.
Once I am back behind the UTM network the list now works – for other members of our team as well. Problem Solved.
I think if you do some browser maintenance, this issue will clear up for you. Check here for instruction.
If that doesn't resolve the issue, try loading the trello board in an incognito browser and see if you experience the same. If loading in incognito clears up the issue, it's possible that you have a Chrome Extension that is interfering with the board's functionality and you'll need to disable extensions one by one to determine the culprit.
I have cleared the browser data as per the link, disabled all extensions as well as tried this in incognito mode. Unfortunately the issue persists - irrespective of which board I attempt to load power-ups on.
I have then tried uninstalling all extensions to no avail.
Any other suggestions?
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