I have an extra apex head (brain) unit if you need one (not the one I just sold but I had two, now with one extra)
For the classic, can you still get into the control screen on your local network? Through that you should be able to update all the firmware that you download from Neptune.
Try unplugging and resetting the Apex without the display plugged in. Then try plugging it in. Through the display I think you can also update firmware, but it's clunky. I would get each unit up to speed on the firmware version.
That would likely solve the Fusion view problem.
https://forum.neptunesystems.com/forumdisplay.php?2-Apex-Classic-Apex-Lite-Apex-Jr