Screen runs same resolution as when it's not running seamless. 1900*1024. I've also tried setting it down. No luck.
If I don't do anything it will eventually disconnect.
The primary computer is showing the screen as screen nr 3. And it's extended.
End of Anileania's quote
Just to be clear, this is when you try to initiate a "Seamless Display" connection, you are able to get it to connect but its a black screen, and eventually fails.
If all is true, we would like to get some logs from you. To create them, you will need 'DebugView'
https://learn.microsoft.com/en-us/sysinternals/downloads/debugview
You will as need to create a new Registry key here:
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Stardock\Multiplicity2\MP\MP\
the key name, type, and value
Name: EnableDebug
type: REG_SZ ('String')
value = 1
Example when done

If you are not comfortable working in the registry, you can use this batch file to create it
https://cdn.stardock.us/support/uploads/Mp4_DebugSwitch.zip
Running it will create it with the correct value. Running it again will turn it off - something you are going to want to do after you have done the collection.
Once complete...
- Close any open applications
- Open the Multiplicity config
- Open Debugview64.exe
- Initiate a Seamless Display connection and allow it to eventually fail (as you said it eventually does with no interaction from you).
- Stop DebugView from collecting

- Save the log out with 'Primary' somewhere in the name.
- The same process should be done on the Secondary but the regkey creation should not be needed as it already outputs debug messages that DebugView can collect.
- Save the logs, zip them together, and upload the zip to a shared drive of your choice (GoogleDrive, DropBox, etc) and post a shared link in a reply
This is a video of the capture process
https://cdn.stardock.us/support/uploads/2024-11-07_13-23-48amcguinness.mp4
Thanks for the help.
Sean Drohan
Stardock Product Lifecycle Manager