Hi Albee and The Weed, I just wanted to say thank you for the fast replies at the time and sorry for taking so long to reply. I had somehow fixed the problem and apologize for forgetting to reply with a description of the fix.
The same problem has made an appearance and I've opened a new thread/ post:
https://duc.avid.com/showthread.php?t=420120
Will have a look at what you suggested and get back to you, many thanks, your help is hugely appreciated :)
Kind regards
Kab