One of my co-workers just recently received a "License is Invalid" error message when she tried to open Civil 3D 2012. It also popped up when she tried to open Civil 3D 2013 as well.
I have the same spec'd computer as hers and connected to the same server and I don't get those error messages.
Is she sure she installed the network version and not the standalone? It's easy to miss the radio button for this during the install.
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