Try this:

I see "There was an error in creating a connection to the Bitcoin network" in the corner

You most likely have a corrupted file in your wallet directory. Here's the procedure to resolve the situation:

1. Start MultiBit HD as normal
2. Unlock your wallet and click Finish as normal
3. Click "Manage Wallet" in the sidebar and click the "Wallet dashboard" button
4. Make a note of your "application directory" and your "wallet directory" (copy/paste into a text editor is useful here)
5. Close MultiBit HD in the usual way
6. Open a file browser and navigate to the "application directory" and from there into your "wallet directory"
7. Locate the file called mbhd.spvchain and delete it
8. Start MultiBit HD as normal and unlock your wallet
9. You should now be able to connect to the Bitcoin network and after a much longer synchronization process than usual your balance will be restored