Non-Domain joined clients connect to server initially but cannot connect via Launchpad

Running SBS 2011 Essentials in a small office. Running XP/Vista/7 clients. All working fine until we swapped routers. Old router died, new router was installed. 
Now all domain-joined PC's connect as normal, but all NON-Domain-Joined PC's cannot access the server via the launchpad. I get the "The server appears to be offline. Do you want to sign in to offline mode?" box. 
Tried removing PC from the SBS Dashboard, uninstalling the connector from the client, restarting client, and reinstalling the connector. I can install the connector (using
http://<server ip>/connect , but not http://<servername>/connect
). Connector installs but it still tells me the server is offline when trying to use dashboard or launchpad on the client.
Note: I can add a network location or Map a network drive to ther server after inputting my network password from Windows.
Any Services to check? Firewalls exceptions to ensure? Advice?
EDIT: Dashboard on Server shows Client, sometimes as online, sometimes as offline. 

Sounds like name resolution issue to me.
Are all your clients set to use the IP of the Essentials Server for their primary DNS?
Robert Pearman SBS MVP
itauthority.co.uk |
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