Okay. Please post the logs again, after making sure that ArmoryDB isn't already running when you start Armory. (You can go into the task manager and kill ArmoryDB if it's already running.)
Okay, I tried again from scratch with Armory RC1 and Bitcoin Core 15.1
When I installed Armory RC1 and started it up, Bitcoin Core was already running.
This time, I got a bit further than prior times. Armory successfully completed the Database Scanning & Building phase. Once this was done, then it actually said 'Node online' at the bottom (for the first time ever!).
I then proceeded to import an old wallet that I'm trying to restore. Armory imported the wallet and began Scanning Transaction History. Everything seemed to be going okay, and after a couple of hours it was at ~20% complete.
Then, out of nowhere, I see an error message that the connection to Bitcoin Node was lost, and the message at the bottom once again said 'Node offline'.
I waited a while, but the 'Node offline' message persisted. I quit Armory, shut down ArmoryDB from task manager, and restarted Armory. When I restarted, it immediately defaulted to 'Node offline' again and hasn't changed since. It still says 'Scanning Transaction History' (started from 0% again), but I suspect it won't finish since it's not connected to the bitcoin node.
Here is the full log file for everything I just described.
https://pastebin.com/ZVgT7Pa7