Just wanted to say a big thanks to Merino-Noir!
Thanks to your advice I've discovered the DivX Player. It works like a dream, you just select which file you want to watch and to which device and it'll play. A message simply pops up on the telly asking if you trust it or something and then it'll start playing once you select accept.
The beauty is that you don't even need to go into the Media Hub on the tv, it's all done through the mac, so hopefully that means I won't experience any spinning wheels. Fingers crossed anyway! It works perfectly for now at least and I'm able once again to watch all the movies and tv shows I have saved (this will definitely come in handy should I need to self isolate for two weeks!).
I'm so happy this has finally been resolved one way or another!
Thanks a lot, Merino, for all the advice and encouragement you've offered here
Thanks everyone, stay safe!
@Merino-Noir - many thanks for the ongoing updates, my problems with USB/hard drives and media hub continue. One point I just want to clarify; you mentioned your other Samsung TV had a firmware update last night, was this a completely new firmware update or a routine update of an older version? I've just checked on the Samsung website and the firmware version for my TV is still listed as being available on 14 Nov 2019 (presumably the one that's caused all the problems). My hope is that Samsung will address the problem and issue a firmware update (without admitting to anything), so I'm hoping this will happen soon.
I have a Samsung LA40C630K1R, does not show any content on my USB drive. I have upgraded my software as well. I see so many people complaining about this with no solution? So I should just go and buy a LG TV then?
Your recommendation works. I downloaded the SmartShare program from https://www.lg.com/ph/support/smart-share and installed it on my PC. Using the MediaHub function on the TV, I was able to connect the TV and watch any media stored on the PC. I hope this will work for a long time while waiting for permanent solution from SAMSUNG.
I've cured the problem it's easy fix
Instead of leaving the TV in standby turn it off,just like the old TVs no standby
It works because I've been doing it since I contributed to this forum