There is a Bug in Severity 2 for this problem. Developers are aware of the problem and they working on a solution for the next release window, will need to deploy code changes and it will require a maintained window. I believe the next release is for about October 29.
For the task you trying to accomplish, please try the following :
reloading and/or using alternative browser such as Chrome with private window or incognito mode helps to get accessible. This problem is intermitent