help! I'm bugged

So when I went onto my server, all my inventory stuff is there, but I can’t click anything. and all the buildings are gone. any reason why??

[editline]6th January 2014[/editline]

also getting an error saying skipped rendering frames because GFxdevice is in invalid state (device lost)

[editline]6th January 2014[/editline]

please someone help.

try disconnecting and restarting steam