Yes, it is the network card.

I can repeat it consistently.
- Start computer
- start Cross -> OK
- disable network
- start Cross -> need to enter Licence.
- enable network
- start Cross -> OK
etc...
it is repeatable with same results all the time.
As I also disable network card when I gig.... so now I also have the licence key on a txt file to start, but it really should not be this way, it is verry annoying and it should really be solved..