Hi @UKMark Robinson, thanks for reaching out and sorry to hear about the trouble with that board.
Since you've already tried different browsers and the desktop app, here are a few other steps that may help:
- 	Ask the board owner to open the board while logged in from an incognito/private window 
- 	Clear the browser cache and cookies, then try accessing the board again 
- 	Check if the board opens when accessed from a different device (e.g., mobile or another computer) 
- 	If possible, ask a collaborator with edit access to see if they can open or duplicate the board 
If none of those work, let me know and I can help escalate the issue.