Ok, shutdown Armory and Bitcoin Core and add the following line to your bitcoin.conf file:
Then try this:
1. Delete the Armory log files (armorylog.txt and dbLog.txt)
2. Reboot your PC (this will clear any ghost processes that might be preventing things from running normally)
3. Start Armory
If it's still showing as "offline", try the "Help -> Rebuild and rescan databses" option in Armory. Then shut Armory down and restart it.
If it still isn't working properly after that, repost the latest copy of your log files.