So the take home is copy to clipboard is botched with non ASCII character sets?
Yes. That's pretty strange. When I'm using german locale settings I can't select addresses via button in the address book, because Armory can't copy it in ASCII character format. As a work-around you can right-klick and copy the address and paste it into the field. When you do this Armory can identify which wallet this address belongs to. So probabbly the clipboard stores non ASCII chars and when you paste them into the text field Armory converts them back into ASCII?
But that work-around doesn't work with Lockboxes. When you create a new one and copy and paste addresses of wallets it says that a unvalid address was entered. Although it identifies the wallet that address is related to.
As for McAfee, was it messing with your blockchain data or Armory's DB?
It was messing with Armory's DB.