Does Armory actually say "connected" in green text with the current number of blocks at the bottom right corner of the Armory window? If not, it's possible that it isn't actually finding your Bitcoin Core data directory properly.
What versions of Bitcoin Core and Armory do you have installed?
Can you please post your Armory logs? (armorylog.txt and dblog.txt... copy/paste the contents to
www.pastebin.com and then copy the generated pastebin link here)