I just upgraded to version 4.0.0.27 Premium. Everything seems fine, and the system is actively scanning all the computers.
However, when I try to manually scan a computer, it says it fails. This is the command I'm running:
lstrigger.exe servername computername domain
And when I run that (even from the server itself, it returns:
C:\Lansweeper>lstrigger.exe server computer domain
Lansweeper trigger client
-------------------------
Connecting...
Failed