First, did you install all the required VSE extensions? Try a different browser? (Chrome / Firefox). Are you using browser add ons? Also try clearing cache/cookies.
AV has been running perfectly fine for a good 3 years.. Extentions all installed back when the servers were built. It is not the browser. I have seen it on the servers themselves and on Win7 and Win10 clients I have. All show Back Screen for that policy section. General Options Policy.
I have a few different versions for different parts of my tree and they are all BLACK. All other policies for AV 8.8 are fine.