Done, created a new post as you mentioned, can't for the life of me see where I can mark as resolved though!!! 🙂
If anyone needs a ERX Router though I have one spare 🙂
You just have to reply to yourself then make that reply as solved.
It’s what I did in my ER-X one to save anyone having to read through pages to find the solution in the longer thread.
Also the ER-X is pre configured, I reckon @Midnight_Voice could be interested, he has taken a shine to Multicast config lately 🙂