I have a few clients that while running a Security and Compliance scan will just pause at this screen until it times out. The only thing I have seen in common is these machines are laptops. Other than that they are running the same client as our desktop machines and run the same OS (Win 7 32 & 46 bit) as our other workstations built off of the same images.
So far I have:
Uninstalled the LD client
Re-installed the LD client Reboots in between.
Disabled anything that could be a firewall
Disabled AV
I can ping the machine from the server
I can remote control the machine fromthe server
I can run an inventory scan
Core is LD 9.0 SP4
Client is a Win-7 64-Bit machine.