Since you'll be using this thread as part of the case, I was having the issue with Firefox v48.x but it is still occurring with Firefox v49.0.1. I do not cache anything in Firefox (or any other browser either).
I was not having the issue with Chrome in the past but had the issue a few moments ago. Using Chrome v53.0.2785.116 m
I did not have the issue with IE v11.x but I prefer not to use IE due to it's inherent security risks.
Note: This conversation was created from a reply on: Check Case Status issue.