Hello,
Sorry to hear you are having trouble.
How long does a client have to wait for a reply to his issue? Is this the type of support to be expected from StarDock support team?
Like many, we are catching up after our company holiday break, tumbledome. Sorry for the delay, however.
- I run 1 VPS windows server r2 2008 at the datacenter that is behind a router. That windows is connected via VPN to the router and the router running the VPN to the office
Just as long as the Multiplicity (MP) rules are set on each PC / VM, and they are on the same subnet (vital), it should be fine. If the IPs are static on the remotes / Secondaries, however, I would recomend using IPs (instead of hostname) in the connection setup to ensure it uses the same subnet as the Primary (the one connecting to it):

- I was able to connect, BUT i get black screen on the 'master' machine which is located at my office.
Just to be clear, that you get a black screen does not mean it is not connected - it's something else.
If when you are connected via MP, and you do a Ctrl + Alt + Backspace (equivalent of Ctrl + Alt + Del when on a Secondary), do you get the expected rendered 'Lock, Switch user, Sign out...' etc, or no you still get a black screen / nothing happens?
If not:
- I'm able to successfully run the Windows RDP in that way
If you have an existing RDP session open, then use MP to KVM connect, do you still get the black screen?
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Sean Drohan
Stardock Customer Service Manager