Is Bitcoin Core running when Armory is running (check task manager to see if bitcoind is running)? If not, try starting Bitcoin Core manually. Go to File > Settings and uncheck (if not already unchecked) the option for "Let Armory run Bitcoin Core in the background. Then stop Armory, start Bitcoin Core, let it sync, and then start Armory.
First of all thank you for your response. I tried your suggestion. However, when I start armory again, after the wallet check-up, the programme seems to hang at "preparing database". Not showing any progress bar or percentage...
best regard
You can solve that issue by deleting Armory's database folder in "%APPDATA%/Armory". The reason is that after upgrading your old database can not be used anymore (not backward-compatible). So by deleting that folder after upgrade you will force a rebuild and rescan.