I checked with Pepperstone. As MagicNumberFX suggested, they are not blocking. Their response:
'Thank you for contacting us. There are no issues on our end and our servers are not blocking updates to myfxbook. Please contact myfxbook support to make sure that they are connecting to our servers.'
I have sent email to my MT4 rep to confirm whether some of the actions specified in the linked article posted by PipGnostic are responsible for this blockage. Will post any response I get.
It is clear that Metatrader is losing touch with it's client base. MT5 completely ignored us. (I've never written an EA that couldn't hedge and I've probably written 100s...and I don't need heavy graphics, just lightweight servers and fast execution) Third parties are providing necessary add-ons that help us do business. If MT wants to block them and control the world then I will look for an alternative. I really wish there was an open-source platform!! Anyhow........