Hi all,

Just sharing this in case someone else runs into this problem.   While evaluating Multiplicity for purchase, I encountered the black screen problem that's been written about in these posts.  I had two remote machines, identical in everyway yet only one would exhibit the black screen problem.   Long story short, I tried all of the recommendations in these posts and nothing worked for me.  I recalled that I had customized the one failing machine ( audio workstation ) to use jumbo ethernet frames for performance reasons.  It was set to 9014 bytes.

I changed it back to the default 1514 bytes and the problem went away.  No more black screen.

There are utilities out there that tweak this setting so it's possible that others have this value changed without even knowing that it happened. 

It would be interesting to see if anyone else who's just given up on fixing this on certain machines could give it a try.  Also, try it on other versions of Windows besides 10.

My entire infrastructure supports jumbo packets throughout and has been working fine with 9014 bytes.  I have IPV6 disabled everywhere.

I tried various combinations of 1514, 4088 and 9014 bytes and Multiplicity definitely prefers 1514 bytes.  At least on my machines.

You can check the setting in Windows 10 under your network adapter for both the Primary and Secondary machines.

Before you begin, have a look at the current settings. 

Open a command prompt and check the MTU values for your adapters on the primary and slaves.

type: netsh interface ipv4 show interfaces

If you see anything other than 1500 for MTU then consider changing the value as follows but first....

Make note of these settings.  Some ISPs tweak these for their infrastructure and changing these values may break your access to the internet.  If you're seeing 9000 and you're currently able to access the internet then it's unlikely that you'll cause any problems by changing the value back to 1514 byte frames.

If your machine has multiple Ethernet ports, then make certain that you have identified the current adapter.

Go to - Network and Sharing Centre > change adapter settings > pick your adapter - properties - under Networking Tab - > configure - advanced

Look up something that mentions support jumbo frames or jumbo packets and set the value to disabled or to 1514 bytes.

As previously mentioned, do this on both the primary and on the seconday.

Give it few seconds to reconfigure your network and they try connecting from the primary again.

Cheers

Alain Zagar