short update, I don’t know if it’s turning off of the addblocker or something else but I could now change the FileSizeValidation file (with the ‘empty newline’) so that it no longer gives the rightserror.
Upon further inspection it seems that the cookie deletion must be a local issue; when I close edge and open it again the page loads normally - and others dont have the same issue. (nb. I double checked cookies dont auto delete upon closing the browser)
Unfortunately despite these developments the issue remains!
updated to 15.0 , no effect on the issue