Can't see stream within Event setup

Hi,

I'm running a couple of 2CD2345FWD and I've just updated to the latest firmware - V5.6.5 build 200316, hoping it may fix my issue.

When I originally set up the devices, I was able to see the streamed picture to allow setting up functions like crossed line etc.
I want to adjust the settings as some events are being missed.

I've tried a few browsers (Chrome & Firefox) but I am unable to see the stream when viewing Events. Even in the live view, I need to switch between streams a few...

Can't see stream within Event setup