This also happened for me un Beta 6 ....
My solution so far has been to manually delete one of the Parallels Connections (not the eth2, but the other one). Once I did this, my Ethernet (cabled connection) was back, and my mini booted faster (I had noticed that it was taking my mini around 3 minutes longer to load other kernel extensions - specifically Intego extensions).
Having deleted this entry has resulted in me no longer being able to select host only networking in the VM setup, but I have not been using this connection type - so it suits my purpose.